Generally speaking.... motor oil additives have not been recommended for
years - decades..... as long as you use a good quality oil.

As for the brands you specifically mentioned... well I am no automotive
engineer but I have a list, from AUDI, of synthetic oils they have tested
and approved for use in their engines.

The thing I found interesting was not what brands were listed but the brands
that were NOT approved.

Anyone interested in a copy of this 1 page PDF file just send an e-mail to
my listed e-address... just remove the SPAM.


"jeepney driver via CarKB.com" <u17884@uwe> wrote in message
news:5b305d7cf9b23@uwe...
> Jerry Bransford wrote:
>>A long talk with a Mobil Oil engineer at a trade show cured a similar
>>long-standing fear I had of 5W-30.
>>
>>>>i'm using mobil 5w-30 synthetic oil .....
>>>
>>[quoted text clipped - 6 lines]
>>> when the motor was cranked. Like you I was using 5w-30 synthetic (Mobile
>>> 1).
>>> Not any more.
>>thank you everyone for the info. the reason i was asking was because i
>>started to use mobil 5w-30 syenthetic three to four oil changes ago and
>>now i hear a clicking sound at start up and then when it warms up it goes
>>away. the weather out here in san diego in the winter about 43 deg and in
>>the summer it gets about 95 deg. my budy told me it would be better to
>>keep it at synthetic and go back to 10w-30. he also told me it would be
>>good to use "lucas" oil engine treatment. i asked him whats the diffrence
>>from royal purple or red line. can someone help i don't want to blow my
>>motor and i would love to get the fuull potentual out of my jeep thanks
>>again
>
> --
> Message posted via http://www.carkb.com

 

Generally speaking.... motor oil additives have not been recommended for
years - decades..... as long as you use a good quality oil.

As for the brands you specifically mentioned... well I am no automotive
engineer but I have a list, from AUDI, of synthetic oils they have tested
and approved for use in their engines.

The thing I found interesting was not what brands were listed but the brands
that were NOT approved.

Anyone interested in a copy of this 1 page PDF file just send an e-mail to
my listed e-address... just remove the SPAM.


"jeepney driver via CarKB.com" <u17884@uwe> wrote in message
news:5b305d7cf9b23@uwe...
> Jerry Bransford wrote:
>>A long talk with a Mobil Oil engineer at a trade show cured a similar
>>long-standing fear I had of 5W-30.
>>
>>>>i'm using mobil 5w-30 synthetic oil .....
>>>
>>[quoted text clipped - 6 lines]
>>> when the motor was cranked. Like you I was using 5w-30 synthetic (Mobile
>>> 1).
>>> Not any more.
>>thank you everyone for the info. the reason i was asking was because i
>>started to use mobil 5w-30 syenthetic three to four oil changes ago and
>>now i hear a clicking sound at start up and then when it warms up it goes
>>away. the weather out here in san diego in the winter about 43 deg and in
>>the summer it gets about 95 deg. my budy told me it would be better to
>>keep it at synthetic and go back to 10w-30. he also told me it would be
>>good to use "lucas" oil engine treatment. i asked him whats the diffrence
>>from royal purple or red line. can someone help i don't want to blow my
>>motor and i would love to get the fuull potentual out of my jeep thanks
>>again
>
> --
> Message posted via http://www.carkb.com

 

Generally speaking.... motor oil additives have not been recommended for
years - decades..... as long as you use a good quality oil.

As for the brands you specifically mentioned... well I am no automotive
engineer but I have a list, from AUDI, of synthetic oils they have tested
and approved for use in their engines.

The thing I found interesting was not what brands were listed but the brands
that were NOT approved.

Anyone interested in a copy of this 1 page PDF file just send an e-mail to
my listed e-address... just remove the SPAM.


"jeepney driver via CarKB.com" <u17884@uwe> wrote in message
news:5b305d7cf9b23@uwe...
> Jerry Bransford wrote:
>>A long talk with a Mobil Oil engineer at a trade show cured a similar
>>long-standing fear I had of 5W-30.
>>
>>>>i'm using mobil 5w-30 synthetic oil .....
>>>
>>[quoted text clipped - 6 lines]
>>> when the motor was cranked. Like you I was using 5w-30 synthetic (Mobile
>>> 1).
>>> Not any more.
>>thank you everyone for the info. the reason i was asking was because i
>>started to use mobil 5w-30 syenthetic three to four oil changes ago and
>>now i hear a clicking sound at start up and then when it warms up it goes
>>away. the weather out here in san diego in the winter about 43 deg and in
>>the summer it gets about 95 deg. my budy told me it would be better to
>>keep it at synthetic and go back to 10w-30. he also told me it would be
>>good to use "lucas" oil engine treatment. i asked him whats the diffrence
>>from royal purple or red line. can someone help i don't want to blow my
>>motor and i would love to get the fuull potentual out of my jeep thanks
>>again
>
> --
> Message posted via http://www.carkb.com

 

That chart does not cover the 4 liter engine

"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:43DFC18A.3A97C331@***.net...
> http://www.wkjeeps.com/wk_maintenance.htm#ENGOIL
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Mike Romain wrote:
>>
>> I don't understand why you folks would use an oil that technically could
>> void the engine warranty?
>>
>> If the book calls for 10W30, then using 5W30 is just plain asking for
>> trouble and extra wear due to the thin oil not lubricating or 'staying
>> in' the gaps between friction surfaces.
>>
>> I can see the difference in my mechanical oil pressure gauge when thin
>> oil is used or my oil gets old and thin.
>>
>> I used 5W30 once because I got a 'deal' on it. I very quickly changed
>> it back to the proper oil because the pressure was over 5 psi lower on
>> the highway and especially at idle, it dived really low when hot.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)

 

That chart does not cover the 4 liter engine

"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:43DFC18A.3A97C331@***.net...
> http://www.wkjeeps.com/wk_maintenance.htm#ENGOIL
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Mike Romain wrote:
>>
>> I don't understand why you folks would use an oil that technically could
>> void the engine warranty?
>>
>> If the book calls for 10W30, then using 5W30 is just plain asking for
>> trouble and extra wear due to the thin oil not lubricating or 'staying
>> in' the gaps between friction surfaces.
>>
>> I can see the difference in my mechanical oil pressure gauge when thin
>> oil is used or my oil gets old and thin.
>>
>> I used 5W30 once because I got a 'deal' on it. I very quickly changed
>> it back to the proper oil because the pressure was over 5 psi lower on
>> the highway and especially at idle, it dived really low when hot.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)

 

That chart does not cover the 4 liter engine

"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:43DFC18A.3A97C331@***.net...
> http://www.wkjeeps.com/wk_maintenance.htm#ENGOIL
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Mike Romain wrote:
>>
>> I don't understand why you folks would use an oil that technically could
>> void the engine warranty?
>>
>> If the book calls for 10W30, then using 5W30 is just plain asking for
>> trouble and extra wear due to the thin oil not lubricating or 'staying
>> in' the gaps between friction surfaces.
>>
>> I can see the difference in my mechanical oil pressure gauge when thin
>> oil is used or my oil gets old and thin.
>>
>> I used 5W30 once because I got a 'deal' on it. I very quickly changed
>> it back to the proper oil because the pressure was over 5 psi lower on
>> the highway and especially at idle, it dived really low when hot.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)

 

That's because it's for a WK. I just put it up because it showed
the hemi's 5W-20. I use 20W-50 Pennzoil in my Bronco and T-birds with
over three hundred thousand miles, that have never been apart.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

billy ray wrote:
>
> That chart does not cover the 4 liter engine

 

That's because it's for a WK. I just put it up because it showed
the hemi's 5W-20. I use 20W-50 Pennzoil in my Bronco and T-birds with
over three hundred thousand miles, that have never been apart.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

billy ray wrote:
>
> That chart does not cover the 4 liter engine

 

That's because it's for a WK. I just put it up because it showed
the hemi's 5W-20. I use 20W-50 Pennzoil in my Bronco and T-birds with
over three hundred thousand miles, that have never been apart.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

billy ray wrote:
>
> That chart does not cover the 4 liter engine

 

Thinner oil could drain from the mains, while parked. Thicker oil than
warranted may not be pumped to the bearings fast enough. Oil pressure
gauges measure the pressure in the oil galleries, not at the bearings where
it counts. Unless you have a race prepared engine with non-stock bearing
clearances, and you know exactly what you are doing, it is best to use the
oil recommended for street use. For most of the vehicles discussed here,
that is 10W30.

Earle

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:43DFBC6F.9A970306@***.net...
> Hi Mike,
> Thinner oil will drain from the mains, while parked. Usually you
> hear the telltale low knock noise about two or three times before the
> oil separates the metals.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Mike Romain wrote:
> >
> > Good question. It also appears to burn up or get used faster. When
> > used it physically 'feels' thinner too.
> >
> > Maybe that is it. My mechanical oil pressure gauge does read lower when
> > the oil level get low. Every time. I can look at it and know if I will
> > be down a liter. Could be it allows the engine to run hotter??
> >
> > Don't really know.
> >
> > Mike