I would not think using 20w-50 in an engine designed for 10w-30 that has
110,000 miles would put undue strain on the oil pump. Thicker oil would
"make up" for some of the excess gap in a worn out oil pump.

Nor do I regard 10w-40 and 20w-50 as "heavy" oils. Until relatively
recently 10w-40 was considered a "standard" weight oil. Heavy weight oils
such as "straight" 40, 50, and 70 weight were used in high pressure, high
power, high altitude, and super-charged engines.

Frequent oil and filter changes are important as well as the type of oil
itself. I use synthetic or synthetic blend oil which can have the effect of
"lowering" oil pressure (a measurement of resistance to flow) because of its
naturally superior fluidity (the inverse of viscosity)

"Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> You can but you will cause further wear of the oil pump or failure all
> together. Dodge Rams had issues with oil pumps failing a an extreme high
> rate and after all said and done it was discovered that the owners were
> using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> viscosity and more wear protection in vehicles that specify them. Heavy
> oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> weight oil will cause damage to the oil pump. As Mike said just change
> your oil.
>
> --
> Coasty
> SEMPAR PARATUS
> (ALWAYS READY)
>
> Remove The SPOOGE To Reply
> "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
>> You can also use heavier weight oil to prop up the pressure readings.
>>
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:42D3F8E8.AC8BA3E3@sympatico.ca...
>>>I would just keep fresh oil and filters in it and realize it is showing
>>> it's age. The only real fix is a rebuild.
>>>
>>> Fresh oil does wonders top keeping the pressure up, when mine starts to
>>> drop when hot, I know it is time for a change.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>>
>>> Cal wrote:
>>>>
>>>> Hi!
>>>>
>>>> I've read many posts here about the lousy oil sending units in these
>>>> jeeps.
>>>> Well, dropping off to zero is really scary, so I decided to attach a
>>>> mechanical oil pressure gauge to determine what is really going on with
>>>> this
>>>> pressure. When cold, this engine has around 30-40 lbs pressure at
>>>> idle, but
>>>> when hot, it normally hovers around 30 at highway speeds, and will drop
>>>> to
>>>> zero most often at idle. The mechanical gauge never shows it dropping
>>>> to
>>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
>>>> at
>>>> idle is acceptable.
>>>> I know the possible causes are oil pump, air leak at pick-up tube,
>>>> perhaps
>>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
>>>> no
>>>> unusual engine noises that would maybe indicate bearings. It really
>>>> doesn't
>>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
>>>> what
>>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
>>>> Any
>>>> ideas??
>>>>
>>>> cal
>>
>>
>
>

 

That's what I use, 20/50 Pennz. I do think while you are under
warranty we should use whatever the owner's manual recommends. My Bronco
with over tree hundred and fifty thousand miles and the heads have never
been off, idles hot at fifty pounds: http://www.----------.com/smog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

BillyRay wrote:
>
> I would not think using 20w-50 in an engine designed for 10w-30 that has
> 110,000 miles would put undue strain on the oil pump. Thicker oil would
> "make up" for some of the excess gap in a worn out oil pump.
>
> Nor do I regard 10w-40 and 20w-50 as "heavy" oils. Until relatively
> recently 10w-40 was considered a "standard" weight oil. Heavy weight oils
> such as "straight" 40, 50, and 70 weight were used in high pressure, high
> power, high altitude, and super-charged engines.
>
> Frequent oil and filter changes are important as well as the type of oil
> itself. I use synthetic or synthetic blend oil which can have the effect of
> "lowering" oil pressure (a measurement of resistance to flow) because of its
> naturally superior fluidity (the inverse of viscosity)
>
> "Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
> news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> > You can but you will cause further wear of the oil pump or failure all
> > together. Dodge Rams had issues with oil pumps failing a an extreme high
> > rate and after all said and done it was discovered that the owners were
> > using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> > it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> > viscosity and more wear protection in vehicles that specify them. Heavy
> > oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> > weight oil will cause damage to the oil pump. As Mike said just change
> > your oil.
> >
> > --
> > Coasty
> > SEMPAR PARATUS
> > (ALWAYS READY)
> >
> > Remove The SPOOGE To Reply
> > "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> > news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
> >> You can also use heavier weight oil to prop up the pressure readings.
> >>
> >>
> >> "Mike Romain" <romainm@sympatico.ca> wrote in message
> >> news:42D3F8E8.AC8BA3E3@sympatico.ca...
> >>>I would just keep fresh oil and filters in it and realize it is showing
> >>> it's age. The only real fix is a rebuild.
> >>>
> >>> Fresh oil does wonders top keeping the pressure up, when mine starts to
> >>> drop when hot, I know it is time for a change.
> >>>
> >>> Mike
> >>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> >>> 88 Cherokee 235 BFG AT's
> >>>
> >>> Cal wrote:
> >>>>
> >>>> Hi!
> >>>>
> >>>> I've read many posts here about the lousy oil sending units in these
> >>>> jeeps.
> >>>> Well, dropping off to zero is really scary, so I decided to attach a
> >>>> mechanical oil pressure gauge to determine what is really going on with
> >>>> this
> >>>> pressure. When cold, this engine has around 30-40 lbs pressure at
> >>>> idle, but
> >>>> when hot, it normally hovers around 30 at highway speeds, and will drop
> >>>> to
> >>>> zero most often at idle. The mechanical gauge never shows it dropping
> >>>> to
> >>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
> >>>> at
> >>>> idle is acceptable.
> >>>> I know the possible causes are oil pump, air leak at pick-up tube,
> >>>> perhaps
> >>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
> >>>> no
> >>>> unusual engine noises that would maybe indicate bearings. It really
> >>>> doesn't
> >>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
> >>>> what
> >>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
> >>>> Any
> >>>> ideas??
> >>>>
> >>>> cal
> >>
> >>
> >
> >

 

That's what I use, 20/50 Pennz. I do think while you are under
warranty we should use whatever the owner's manual recommends. My Bronco
with over tree hundred and fifty thousand miles and the heads have never
been off, idles hot at fifty pounds: http://www.----------.com/smog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

BillyRay wrote:
>
> I would not think using 20w-50 in an engine designed for 10w-30 that has
> 110,000 miles would put undue strain on the oil pump. Thicker oil would
> "make up" for some of the excess gap in a worn out oil pump.
>
> Nor do I regard 10w-40 and 20w-50 as "heavy" oils. Until relatively
> recently 10w-40 was considered a "standard" weight oil. Heavy weight oils
> such as "straight" 40, 50, and 70 weight were used in high pressure, high
> power, high altitude, and super-charged engines.
>
> Frequent oil and filter changes are important as well as the type of oil
> itself. I use synthetic or synthetic blend oil which can have the effect of
> "lowering" oil pressure (a measurement of resistance to flow) because of its
> naturally superior fluidity (the inverse of viscosity)
>
> "Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
> news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> > You can but you will cause further wear of the oil pump or failure all
> > together. Dodge Rams had issues with oil pumps failing a an extreme high
> > rate and after all said and done it was discovered that the owners were
> > using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> > it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> > viscosity and more wear protection in vehicles that specify them. Heavy
> > oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> > weight oil will cause damage to the oil pump. As Mike said just change
> > your oil.
> >
> > --
> > Coasty
> > SEMPAR PARATUS
> > (ALWAYS READY)
> >
> > Remove The SPOOGE To Reply
> > "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> > news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
> >> You can also use heavier weight oil to prop up the pressure readings.
> >>
> >>
> >> "Mike Romain" <romainm@sympatico.ca> wrote in message
> >> news:42D3F8E8.AC8BA3E3@sympatico.ca...
> >>>I would just keep fresh oil and filters in it and realize it is showing
> >>> it's age. The only real fix is a rebuild.
> >>>
> >>> Fresh oil does wonders top keeping the pressure up, when mine starts to
> >>> drop when hot, I know it is time for a change.
> >>>
> >>> Mike
> >>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> >>> 88 Cherokee 235 BFG AT's
> >>>
> >>> Cal wrote:
> >>>>
> >>>> Hi!
> >>>>
> >>>> I've read many posts here about the lousy oil sending units in these
> >>>> jeeps.
> >>>> Well, dropping off to zero is really scary, so I decided to attach a
> >>>> mechanical oil pressure gauge to determine what is really going on with
> >>>> this
> >>>> pressure. When cold, this engine has around 30-40 lbs pressure at
> >>>> idle, but
> >>>> when hot, it normally hovers around 30 at highway speeds, and will drop
> >>>> to
> >>>> zero most often at idle. The mechanical gauge never shows it dropping
> >>>> to
> >>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
> >>>> at
> >>>> idle is acceptable.
> >>>> I know the possible causes are oil pump, air leak at pick-up tube,
> >>>> perhaps
> >>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
> >>>> no
> >>>> unusual engine noises that would maybe indicate bearings. It really
> >>>> doesn't
> >>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
> >>>> what
> >>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
> >>>> Any
> >>>> ideas??
> >>>>
> >>>> cal
> >>
> >>
> >
> >

 

That's what I use, 20/50 Pennz. I do think while you are under
warranty we should use whatever the owner's manual recommends. My Bronco
with over tree hundred and fifty thousand miles and the heads have never
been off, idles hot at fifty pounds: http://www.----------.com/smog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

BillyRay wrote:
>
> I would not think using 20w-50 in an engine designed for 10w-30 that has
> 110,000 miles would put undue strain on the oil pump. Thicker oil would
> "make up" for some of the excess gap in a worn out oil pump.
>
> Nor do I regard 10w-40 and 20w-50 as "heavy" oils. Until relatively
> recently 10w-40 was considered a "standard" weight oil. Heavy weight oils
> such as "straight" 40, 50, and 70 weight were used in high pressure, high
> power, high altitude, and super-charged engines.
>
> Frequent oil and filter changes are important as well as the type of oil
> itself. I use synthetic or synthetic blend oil which can have the effect of
> "lowering" oil pressure (a measurement of resistance to flow) because of its
> naturally superior fluidity (the inverse of viscosity)
>
> "Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
> news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> > You can but you will cause further wear of the oil pump or failure all
> > together. Dodge Rams had issues with oil pumps failing a an extreme high
> > rate and after all said and done it was discovered that the owners were
> > using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> > it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> > viscosity and more wear protection in vehicles that specify them. Heavy
> > oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> > weight oil will cause damage to the oil pump. As Mike said just change
> > your oil.
> >
> > --
> > Coasty
> > SEMPAR PARATUS
> > (ALWAYS READY)
> >
> > Remove The SPOOGE To Reply
> > "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> > news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
> >> You can also use heavier weight oil to prop up the pressure readings.
> >>
> >>
> >> "Mike Romain" <romainm@sympatico.ca> wrote in message
> >> news:42D3F8E8.AC8BA3E3@sympatico.ca...
> >>>I would just keep fresh oil and filters in it and realize it is showing
> >>> it's age. The only real fix is a rebuild.
> >>>
> >>> Fresh oil does wonders top keeping the pressure up, when mine starts to
> >>> drop when hot, I know it is time for a change.
> >>>
> >>> Mike
> >>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> >>> 88 Cherokee 235 BFG AT's
> >>>
> >>> Cal wrote:
> >>>>
> >>>> Hi!
> >>>>
> >>>> I've read many posts here about the lousy oil sending units in these
> >>>> jeeps.
> >>>> Well, dropping off to zero is really scary, so I decided to attach a
> >>>> mechanical oil pressure gauge to determine what is really going on with
> >>>> this
> >>>> pressure. When cold, this engine has around 30-40 lbs pressure at
> >>>> idle, but
> >>>> when hot, it normally hovers around 30 at highway speeds, and will drop
> >>>> to
> >>>> zero most often at idle. The mechanical gauge never shows it dropping
> >>>> to
> >>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
> >>>> at
> >>>> idle is acceptable.
> >>>> I know the possible causes are oil pump, air leak at pick-up tube,
> >>>> perhaps
> >>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
> >>>> no
> >>>> unusual engine noises that would maybe indicate bearings. It really
> >>>> doesn't
> >>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
> >>>> what
> >>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
> >>>> Any
> >>>> ideas??
> >>>>
> >>>> cal
> >>
> >>
> >
> >

 

That's what I use, 20/50 Pennz. I do think while you are under
warranty we should use whatever the owner's manual recommends. My Bronco
with over tree hundred and fifty thousand miles and the heads have never
been off, idles hot at fifty pounds: http://www.----------.com/smog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

BillyRay wrote:
>
> I would not think using 20w-50 in an engine designed for 10w-30 that has
> 110,000 miles would put undue strain on the oil pump. Thicker oil would
> "make up" for some of the excess gap in a worn out oil pump.
>
> Nor do I regard 10w-40 and 20w-50 as "heavy" oils. Until relatively
> recently 10w-40 was considered a "standard" weight oil. Heavy weight oils
> such as "straight" 40, 50, and 70 weight were used in high pressure, high
> power, high altitude, and super-charged engines.
>
> Frequent oil and filter changes are important as well as the type of oil
> itself. I use synthetic or synthetic blend oil which can have the effect of
> "lowering" oil pressure (a measurement of resistance to flow) because of its
> naturally superior fluidity (the inverse of viscosity)
>
> "Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
> news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> > You can but you will cause further wear of the oil pump or failure all
> > together. Dodge Rams had issues with oil pumps failing a an extreme high
> > rate and after all said and done it was discovered that the owners were
> > using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> > it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> > viscosity and more wear protection in vehicles that specify them. Heavy
> > oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> > weight oil will cause damage to the oil pump. As Mike said just change
> > your oil.
> >
> > --
> > Coasty
> > SEMPAR PARATUS
> > (ALWAYS READY)
> >
> > Remove The SPOOGE To Reply
> > "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> > news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
> >> You can also use heavier weight oil to prop up the pressure readings.
> >>
> >>
> >> "Mike Romain" <romainm@sympatico.ca> wrote in message
> >> news:42D3F8E8.AC8BA3E3@sympatico.ca...
> >>>I would just keep fresh oil and filters in it and realize it is showing
> >>> it's age. The only real fix is a rebuild.
> >>>
> >>> Fresh oil does wonders top keeping the pressure up, when mine starts to
> >>> drop when hot, I know it is time for a change.
> >>>
> >>> Mike
> >>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> >>> 88 Cherokee 235 BFG AT's
> >>>
> >>> Cal wrote:
> >>>>
> >>>> Hi!
> >>>>
> >>>> I've read many posts here about the lousy oil sending units in these
> >>>> jeeps.
> >>>> Well, dropping off to zero is really scary, so I decided to attach a
> >>>> mechanical oil pressure gauge to determine what is really going on with
> >>>> this
> >>>> pressure. When cold, this engine has around 30-40 lbs pressure at
> >>>> idle, but
> >>>> when hot, it normally hovers around 30 at highway speeds, and will drop
> >>>> to
> >>>> zero most often at idle. The mechanical gauge never shows it dropping
> >>>> to
> >>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
> >>>> at
> >>>> idle is acceptable.
> >>>> I know the possible causes are oil pump, air leak at pick-up tube,
> >>>> perhaps
> >>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
> >>>> no
> >>>> unusual engine noises that would maybe indicate bearings. It really
> >>>> doesn't
> >>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
> >>>> what
> >>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
> >>>> Any
> >>>> ideas??
> >>>>
> >>>> cal
> >>
> >>
> >
> >

 

Note my earlier post: 91YJ Mileage Milestone, 7/10/2005. I've run Vavoline
Maxlife 20/50 the last 150,000 miles except in winter when I change to
20/40. Oil pressure is steady at 45-50psi at rpm above 1500. At idle,
stays steady at 35psi. Also, I believe that when the oil sending unit fails
it pegs at max on the oil pressure gauge not zero. That's been my
experience with two previous failures.

Scott 91YJ
"Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> You can but you will cause further wear of the oil pump or failure all
> together. Dodge Rams had issues with oil pumps failing a an extreme high
> rate and after all said and done it was discovered that the owners were
> using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> viscosity and more wear protection in vehicles that specify them. Heavy
> oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> weight oil will cause damage to the oil pump. As Mike said just change
> your oil.
>
> --
> Coasty
> SEMPAR PARATUS
> (ALWAYS READY)
>
> Remove The SPOOGE To Reply
> "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
>> You can also use heavier weight oil to prop up the pressure readings.
>>
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:42D3F8E8.AC8BA3E3@sympatico.ca...
>>>I would just keep fresh oil and filters in it and realize it is showing
>>> it's age. The only real fix is a rebuild.
>>>
>>> Fresh oil does wonders top keeping the pressure up, when mine starts to
>>> drop when hot, I know it is time for a change.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>>
>>> Cal wrote:
>>>>
>>>> Hi!
>>>>
>>>> I've read many posts here about the lousy oil sending units in these
>>>> jeeps.
>>>> Well, dropping off to zero is really scary, so I decided to attach a
>>>> mechanical oil pressure gauge to determine what is really going on with
>>>> this
>>>> pressure. When cold, this engine has around 30-40 lbs pressure at
>>>> idle, but
>>>> when hot, it normally hovers around 30 at highway speeds, and will drop
>>>> to
>>>> zero most often at idle. The mechanical gauge never shows it dropping
>>>> to
>>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
>>>> at
>>>> idle is acceptable.
>>>> I know the possible causes are oil pump, air leak at pick-up tube,
>>>> perhaps
>>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
>>>> no
>>>> unusual engine noises that would maybe indicate bearings. It really
>>>> doesn't
>>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
>>>> what
>>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
>>>> Any
>>>> ideas??
>>>>
>>>> cal
>>
>>
>
>

 

Note my earlier post: 91YJ Mileage Milestone, 7/10/2005. I've run Vavoline
Maxlife 20/50 the last 150,000 miles except in winter when I change to
20/40. Oil pressure is steady at 45-50psi at rpm above 1500. At idle,
stays steady at 35psi. Also, I believe that when the oil sending unit fails
it pegs at max on the oil pressure gauge not zero. That's been my
experience with two previous failures.

Scott 91YJ
"Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> You can but you will cause further wear of the oil pump or failure all
> together. Dodge Rams had issues with oil pumps failing a an extreme high
> rate and after all said and done it was discovered that the owners were
> using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> viscosity and more wear protection in vehicles that specify them. Heavy
> oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> weight oil will cause damage to the oil pump. As Mike said just change
> your oil.
>
> --
> Coasty
> SEMPAR PARATUS
> (ALWAYS READY)
>
> Remove The SPOOGE To Reply
> "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
>> You can also use heavier weight oil to prop up the pressure readings.
>>
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:42D3F8E8.AC8BA3E3@sympatico.ca...
>>>I would just keep fresh oil and filters in it and realize it is showing
>>> it's age. The only real fix is a rebuild.
>>>
>>> Fresh oil does wonders top keeping the pressure up, when mine starts to
>>> drop when hot, I know it is time for a change.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>>
>>> Cal wrote:
>>>>
>>>> Hi!
>>>>
>>>> I've read many posts here about the lousy oil sending units in these
>>>> jeeps.
>>>> Well, dropping off to zero is really scary, so I decided to attach a
>>>> mechanical oil pressure gauge to determine what is really going on with
>>>> this
>>>> pressure. When cold, this engine has around 30-40 lbs pressure at
>>>> idle, but
>>>> when hot, it normally hovers around 30 at highway speeds, and will drop
>>>> to
>>>> zero most often at idle. The mechanical gauge never shows it dropping
>>>> to
>>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
>>>> at
>>>> idle is acceptable.
>>>> I know the possible causes are oil pump, air leak at pick-up tube,
>>>> perhaps
>>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
>>>> no
>>>> unusual engine noises that would maybe indicate bearings. It really
>>>> doesn't
>>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
>>>> what
>>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
>>>> Any
>>>> ideas??
>>>>
>>>> cal
>>
>>
>
>

 

Note my earlier post: 91YJ Mileage Milestone, 7/10/2005. I've run Vavoline
Maxlife 20/50 the last 150,000 miles except in winter when I change to
20/40. Oil pressure is steady at 45-50psi at rpm above 1500. At idle,
stays steady at 35psi. Also, I believe that when the oil sending unit fails
it pegs at max on the oil pressure gauge not zero. That's been my
experience with two previous failures.

Scott 91YJ
"Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> You can but you will cause further wear of the oil pump or failure all
> together. Dodge Rams had issues with oil pumps failing a an extreme high
> rate and after all said and done it was discovered that the owners were
> using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> viscosity and more wear protection in vehicles that specify them. Heavy
> oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> weight oil will cause damage to the oil pump. As Mike said just change
> your oil.
>
> --
> Coasty
> SEMPAR PARATUS
> (ALWAYS READY)
>
> Remove The SPOOGE To Reply
> "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
>> You can also use heavier weight oil to prop up the pressure readings.
>>
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:42D3F8E8.AC8BA3E3@sympatico.ca...
>>>I would just keep fresh oil and filters in it and realize it is showing
>>> it's age. The only real fix is a rebuild.
>>>
>>> Fresh oil does wonders top keeping the pressure up, when mine starts to
>>> drop when hot, I know it is time for a change.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>>
>>> Cal wrote:
>>>>
>>>> Hi!
>>>>
>>>> I've read many posts here about the lousy oil sending units in these
>>>> jeeps.
>>>> Well, dropping off to zero is really scary, so I decided to attach a
>>>> mechanical oil pressure gauge to determine what is really going on with
>>>> this
>>>> pressure. When cold, this engine has around 30-40 lbs pressure at
>>>> idle, but
>>>> when hot, it normally hovers around 30 at highway speeds, and will drop
>>>> to
>>>> zero most often at idle. The mechanical gauge never shows it dropping
>>>> to
>>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
>>>> at
>>>> idle is acceptable.
>>>> I know the possible causes are oil pump, air leak at pick-up tube,
>>>> perhaps
>>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
>>>> no
>>>> unusual engine noises that would maybe indicate bearings. It really
>>>> doesn't
>>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
>>>> what
>>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
>>>> Any
>>>> ideas??
>>>>
>>>> cal
>>
>>
>
>

 

Note my earlier post: 91YJ Mileage Milestone, 7/10/2005. I've run Vavoline
Maxlife 20/50 the last 150,000 miles except in winter when I change to
20/40. Oil pressure is steady at 45-50psi at rpm above 1500. At idle,
stays steady at 35psi. Also, I believe that when the oil sending unit fails
it pegs at max on the oil pressure gauge not zero. That's been my
experience with two previous failures.

Scott 91YJ
"Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
> You can but you will cause further wear of the oil pump or failure all
> together. Dodge Rams had issues with oil pumps failing a an extreme high
> rate and after all said and done it was discovered that the owners were
> using 20w50 oil on 99% of the failures. Thicker is not better, nor does
> it protect better than a thinner oil. 5w30 and 10w30 oils provide better
> viscosity and more wear protection in vehicles that specify them. Heavy
> oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
> weight oil will cause damage to the oil pump. As Mike said just change
> your oil.
>
> --
> Coasty
> SEMPAR PARATUS
> (ALWAYS READY)
>
> Remove The SPOOGE To Reply
> "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
> news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
>> You can also use heavier weight oil to prop up the pressure readings.
>>
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:42D3F8E8.AC8BA3E3@sympatico.ca...
>>>I would just keep fresh oil and filters in it and realize it is showing
>>> it's age. The only real fix is a rebuild.
>>>
>>> Fresh oil does wonders top keeping the pressure up, when mine starts to
>>> drop when hot, I know it is time for a change.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>>
>>> Cal wrote:
>>>>
>>>> Hi!
>>>>
>>>> I've read many posts here about the lousy oil sending units in these
>>>> jeeps.
>>>> Well, dropping off to zero is really scary, so I decided to attach a
>>>> mechanical oil pressure gauge to determine what is really going on with
>>>> this
>>>> pressure. When cold, this engine has around 30-40 lbs pressure at
>>>> idle, but
>>>> when hot, it normally hovers around 30 at highway speeds, and will drop
>>>> to
>>>> zero most often at idle. The mechanical gauge never shows it dropping
>>>> to
>>>> zero, but to 9 or 10 lbs at idle. The owners manual states that 13lbs
>>>> at
>>>> idle is acceptable.
>>>> I know the possible causes are oil pump, air leak at pick-up tube,
>>>> perhaps
>>>> dirty screen, and bearings. This engine has 110,000 miles on it, with
>>>> no
>>>> unusual engine noises that would maybe indicate bearings. It really
>>>> doesn't
>>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
>>>> what
>>>> sounds kinda like a valve lifter, or maybe just common cylinder noise.
>>>> Any
>>>> ideas??
>>>>
>>>> cal
>>
>>
>
>

 

I used 20w-50 for a number of years in the wintertime (in Ohio) and straight
30 weight Zoildeeze (spellin'?) or Series 3 in the summer because of it high
detergent package. In later years I used Rotella T 15w-40 year round for
the same reason.

I now use synthetic or synthetic blend oil.


"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:42D43A9A.53059F6B@***.net...
> That's what I use, 20/50 Pennz. I do think while you are under
> warranty we should use whatever the owner's manual recommends. My Bronco
> with over tree hundred and fifty thousand miles and the heads have never
> been off, idles hot at fifty pounds: http://www.----------.com/smog.jpg
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> BillyRay wrote:
>>
>> I would not think using 20w-50 in an engine designed for 10w-30 that has
>> 110,000 miles would put undue strain on the oil pump. Thicker oil would
>> "make up" for some of the excess gap in a worn out oil pump.
>>
>> Nor do I regard 10w-40 and 20w-50 as "heavy" oils. Until relatively
>> recently 10w-40 was considered a "standard" weight oil. Heavy weight
>> oils
>> such as "straight" 40, 50, and 70 weight were used in high pressure, high
>> power, high altitude, and super-charged engines.
>>
>> Frequent oil and filter changes are important as well as the type of oil
>> itself. I use synthetic or synthetic blend oil which can have the effect
>> of
>> "lowering" oil pressure (a measurement of resistance to flow) because of
>> its
>> naturally superior fluidity (the inverse of viscosity)
>>
>> "Coasty" <uscg_retSPOOGE@comcast.net> wrote in message
>> news:7NWdnUsgubLemEnfRVn-jA@comcast.com...
>> > You can but you will cause further wear of the oil pump or failure all
>> > together. Dodge Rams had issues with oil pumps failing a an extreme
>> > high
>> > rate and after all said and done it was discovered that the owners were
>> > using 20w50 oil on 99% of the failures. Thicker is not better, nor
>> > does
>> > it protect better than a thinner oil. 5w30 and 10w30 oils provide
>> > better
>> > viscosity and more wear protection in vehicles that specify them.
>> > Heavy
>> > oils such as 10w40 or 20w50 in vehicles that do not specify the heavy
>> > weight oil will cause damage to the oil pump. As Mike said just change
>> > your oil.
>> >
>> > --
>> > Coasty
>> > SEMPAR PARATUS
>> > (ALWAYS READY)
>> >
>> > Remove The SPOOGE To Reply
>> > "BillyRay" <jpbSPAM357@junoSPAM.com> wrote in message
>> > news:80b8a$42d3fec0$4831337f$5051@FUSE.NET...
>> >> You can also use heavier weight oil to prop up the pressure readings.
>> >>
>> >>
>> >> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> >> news:42D3F8E8.AC8BA3E3@sympatico.ca...
>> >>>I would just keep fresh oil and filters in it and realize it is
>> >>>showing
>> >>> it's age. The only real fix is a rebuild.
>> >>>
>> >>> Fresh oil does wonders top keeping the pressure up, when mine starts
>> >>> to
>> >>> drop when hot, I know it is time for a change.
>> >>>
>> >>> Mike
>> >>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> >>> 88 Cherokee 235 BFG AT's
>> >>>
>> >>> Cal wrote:
>> >>>>
>> >>>> Hi!
>> >>>>
>> >>>> I've read many posts here about the lousy oil sending units in these
>> >>>> jeeps.
>> >>>> Well, dropping off to zero is really scary, so I decided to attach a
>> >>>> mechanical oil pressure gauge to determine what is really going on
>> >>>> with
>> >>>> this
>> >>>> pressure. When cold, this engine has around 30-40 lbs pressure at
>> >>>> idle, but
>> >>>> when hot, it normally hovers around 30 at highway speeds, and will
>> >>>> drop
>> >>>> to
>> >>>> zero most often at idle. The mechanical gauge never shows it
>> >>>> dropping
>> >>>> to
>> >>>> zero, but to 9 or 10 lbs at idle. The owners manual states that
>> >>>> 13lbs
>> >>>> at
>> >>>> idle is acceptable.
>> >>>> I know the possible causes are oil pump, air leak at pick-up tube,
>> >>>> perhaps
>> >>>> dirty screen, and bearings. This engine has 110,000 miles on it,
>> >>>> with
>> >>>> no
>> >>>> unusual engine noises that would maybe indicate bearings. It really
>> >>>> doesn't
>> >>>> sound any different than it did 3 or 4 years ago.. Sometimes I hear
>> >>>> what
>> >>>> sounds kinda like a valve lifter, or maybe just common cylinder
>> >>>> noise.
>> >>>> Any
>> >>>> ideas??
>> >>>>
>> >>>> cal
>> >>
>> >>
>> >
>> >