Synthetic Oils
07-25-2003, 11:01 PM
#11
Guest
Posts: n/a
Re: Synthetic Oils
Jerry Bransford wrote:
> Yep, that was a real stinker situation... Mobil paid for many aircraft
> engine rebuilds and I never forgot that. That's one reason I'm not totally
> on the synthetic oil bandwagon since it's not quite the miracle lube some
> think it is.
My experience with Castrol Syntec has been favorable. The valve train looks
nice and clean. A little buildup here and there, but that's expected. I think
the ZJ needs the vent hose cleaned.
--
DougW
> Yep, that was a real stinker situation... Mobil paid for many aircraft
> engine rebuilds and I never forgot that. That's one reason I'm not totally
> on the synthetic oil bandwagon since it's not quite the miracle lube some
> think it is.
My experience with Castrol Syntec has been favorable. The valve train looks
nice and clean. A little buildup here and there, but that's expected. I think
the ZJ needs the vent hose cleaned.
--
DougW
07-26-2003, 10:16 PM
#12
Guest
Posts: n/a
Re: Synthetic Oils
I just bought my JGC at the beginning of the year and it had 84K miles. I
wanted to switch to synthetic but was worried because I heard rumors of
leaks. I could not find any documentation or articles to support this,
however. I checked out all of the major manufactures of synthetics including
Mobil 1 to see what they had to say about using it in high mileage vehicles.
Every site I checked indicated there are no problems with using fully
synthetic oils in high mileage vehicles and claim that it will not harm
seals, etc.
I decided to give Mobil 1 a try since I have heard it is the best synthetic.
I have been getting it at the local Sam's Club for $25/case and have been
very pleased. I have noticed less rough idle, easier starts and marked
increase in performance, especially on the take-off. I have had no problems
in the 10K miles I have put on my Jeep this year and plan to keep using it.
Doug
95 ZJ 4.0L
"DougW" <post.replies@invalid.address> wrote in message
news:%9mUa.79084$R92.37110@news2.central.***.net.. .
> Jerry Bransford wrote:
> > Yep, that was a real stinker situation... Mobil paid for many aircraft
> > engine rebuilds and I never forgot that. That's one reason I'm not
totally
> > on the synthetic oil bandwagon since it's not quite the miracle lube
some
> > think it is.
>
> My experience with Castrol Syntec has been favorable. The valve train
looks
> nice and clean. A little buildup here and there, but that's expected. I
think
> the ZJ needs the vent hose cleaned.
>
> --
> DougW
>
>
wanted to switch to synthetic but was worried because I heard rumors of
leaks. I could not find any documentation or articles to support this,
however. I checked out all of the major manufactures of synthetics including
Mobil 1 to see what they had to say about using it in high mileage vehicles.
Every site I checked indicated there are no problems with using fully
synthetic oils in high mileage vehicles and claim that it will not harm
seals, etc.
I decided to give Mobil 1 a try since I have heard it is the best synthetic.
I have been getting it at the local Sam's Club for $25/case and have been
very pleased. I have noticed less rough idle, easier starts and marked
increase in performance, especially on the take-off. I have had no problems
in the 10K miles I have put on my Jeep this year and plan to keep using it.
Doug
95 ZJ 4.0L
"DougW" <post.replies@invalid.address> wrote in message
news:%9mUa.79084$R92.37110@news2.central.***.net.. .
> Jerry Bransford wrote:
> > Yep, that was a real stinker situation... Mobil paid for many aircraft
> > engine rebuilds and I never forgot that. That's one reason I'm not
totally
> > on the synthetic oil bandwagon since it's not quite the miracle lube
some
> > think it is.
>
> My experience with Castrol Syntec has been favorable. The valve train
looks
> nice and clean. A little buildup here and there, but that's expected. I
think
> the ZJ needs the vent hose cleaned.
>
> --
> DougW
>
>
07-27-2003, 01:44 AM
#13
Guest
Posts: n/a
Re: Synthetic Oils
Doug Jones wrote:
> I just bought my JGC at the beginning of the year and it had 84K miles. I
> wanted to switch to synthetic but was worried because I heard rumors of
> leaks.
That only applies to cork gaskets or engines with real bad wear.
> I could not find any documentation or articles to support this,
> however. I checked out all of the major manufactures of synthetics including
> Mobil 1 to see what they had to say about using it in high mileage vehicles.
> Every site I checked indicated there are no problems with using fully
> synthetic oils in high mileage vehicles and claim that it will not harm
> seals, etc.
If you did have older cork or small leaks just replace one quart of syntetic
with a quart of dino.
> I decided to give Mobil 1 a try since I have heard it is the best synthetic.
> I have been getting it at the local Sam's Club for $25/case and have been
> very pleased. I have noticed less rough idle, easier starts and marked
> increase in performance, especially on the take-off. I have had no problems
> in the 10K miles I have put on my Jeep this year and plan to keep using it.
I use Castrol Syntec, but Mobile is good too.
--
-- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
> I just bought my JGC at the beginning of the year and it had 84K miles. I
> wanted to switch to synthetic but was worried because I heard rumors of
> leaks.
That only applies to cork gaskets or engines with real bad wear.
> I could not find any documentation or articles to support this,
> however. I checked out all of the major manufactures of synthetics including
> Mobil 1 to see what they had to say about using it in high mileage vehicles.
> Every site I checked indicated there are no problems with using fully
> synthetic oils in high mileage vehicles and claim that it will not harm
> seals, etc.
If you did have older cork or small leaks just replace one quart of syntetic
with a quart of dino.
> I decided to give Mobil 1 a try since I have heard it is the best synthetic.
> I have been getting it at the local Sam's Club for $25/case and have been
> very pleased. I have noticed less rough idle, easier starts and marked
> increase in performance, especially on the take-off. I have had no problems
> in the 10K miles I have put on my Jeep this year and plan to keep using it.
I use Castrol Syntec, but Mobile is good too.
--
-- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
07-27-2003, 02:17 AM
#14
Guest
Posts: n/a
Re: Synthetic Oils
"DougW" <post.replies@invalid.address> wrote in message
news:YEJUa.82400$R92.56390@news2.central.***.net.. .
> Doug Jones wrote:
> > I just bought my JGC at the beginning of the year and it had 84K miles.
I
> > wanted to switch to synthetic but was worried because I heard rumors of
> > leaks.
>
> That only applies to cork gaskets or engines with real bad wear.
>
> > I could not find any documentation or articles to support this,
> > however. I checked out all of the major manufactures of synthetics
including
> > Mobil 1 to see what they had to say about using it in high mileage
vehicles.
> > Every site I checked indicated there are no problems with using fully
> > synthetic oils in high mileage vehicles and claim that it will not harm
> > seals, etc.
>
> If you did have older cork or small leaks just replace one quart of
syntetic
> with a quart of dino.
Doug, that's no longer needed. Synthetics no longer have that problem since
an additive has been present in them for some time that causes the seals to
swell just like they did with dino/mineral-based oil. I don't run
synthetics myself so I'm not defending them, just passing on what I learned
a year or two ago. :)
Jerry
--
Jerry Bransford
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/
>
> > I decided to give Mobil 1 a try since I have heard it is the best
synthetic.
> > I have been getting it at the local Sam's Club for $25/case and have
been
> > very pleased. I have noticed less rough idle, easier starts and marked
> > increase in performance, especially on the take-off. I have had no
problems
> > in the 10K miles I have put on my Jeep this year and plan to keep using
it.
>
> I use Castrol Syntec, but Mobile is good too.
>
>
> --
> -- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
>
>
news:YEJUa.82400$R92.56390@news2.central.***.net.. .
> Doug Jones wrote:
> > I just bought my JGC at the beginning of the year and it had 84K miles.
I
> > wanted to switch to synthetic but was worried because I heard rumors of
> > leaks.
>
> That only applies to cork gaskets or engines with real bad wear.
>
> > I could not find any documentation or articles to support this,
> > however. I checked out all of the major manufactures of synthetics
including
> > Mobil 1 to see what they had to say about using it in high mileage
vehicles.
> > Every site I checked indicated there are no problems with using fully
> > synthetic oils in high mileage vehicles and claim that it will not harm
> > seals, etc.
>
> If you did have older cork or small leaks just replace one quart of
syntetic
> with a quart of dino.
Doug, that's no longer needed. Synthetics no longer have that problem since
an additive has been present in them for some time that causes the seals to
swell just like they did with dino/mineral-based oil. I don't run
synthetics myself so I'm not defending them, just passing on what I learned
a year or two ago. :)
Jerry
--
Jerry Bransford
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/
>
> > I decided to give Mobil 1 a try since I have heard it is the best
synthetic.
> > I have been getting it at the local Sam's Club for $25/case and have
been
> > very pleased. I have noticed less rough idle, easier starts and marked
> > increase in performance, especially on the take-off. I have had no
problems
> > in the 10K miles I have put on my Jeep this year and plan to keep using
it.
>
> I use Castrol Syntec, but Mobile is good too.
>
>
> --
> -- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
>
>
07-27-2003, 09:55 AM
#15
Guest
Posts: n/a
Re: Synthetic Oils
Jerry Bransford wrote:
> "DougW" wrote
<snippies>
>> If you did have older cork or small leaks just replace one quart of syntetic
>> with a quart of dino.
>
> Doug, that's no longer needed. Synthetics no longer have that problem since
> an additive has been present in them for some time that causes the seals to
> swell just like they did with dino/mineral-based oil. I don't run
> synthetics myself so I'm not defending them, just passing on what I learned
> a year or two ago. :)
Interesting. I went with pure synthetic an haven't had any problems. Not sure
if it's worth the $. Anyhoo, thanks for the info.
--
DougW
> "DougW" wrote
<snippies>
>> If you did have older cork or small leaks just replace one quart of syntetic
>> with a quart of dino.
>
> Doug, that's no longer needed. Synthetics no longer have that problem since
> an additive has been present in them for some time that causes the seals to
> swell just like they did with dino/mineral-based oil. I don't run
> synthetics myself so I'm not defending them, just passing on what I learned
> a year or two ago. :)
Interesting. I went with pure synthetic an haven't had any problems. Not sure
if it's worth the $. Anyhoo, thanks for the info.
--
DougW
07-27-2003, 01:06 PM
#16
Guest
Posts: n/a
Re: Synthetic Oils
DougW wrote:
> Jerry Bransford wrote:
>> "DougW" wrote
>
>
> <snippies>
>
>>> If you did have older cork or small leaks just replace one quart of syntetic
>>> with a quart of dino.
>>
>> Doug, that's no longer needed. Synthetics no longer have that problem since
>> an additive has been present in them for some time that causes the seals to
>> swell just like they did with dino/mineral-based oil. I don't run
>> synthetics myself so I'm not defending them, just passing on what I learned
>> a year or two ago. :)
>
> Interesting. I went with pure synthetic an haven't had any problems. Not sure
> if it's worth the $. Anyhoo, thanks for the info.
Local jeep service manager claims same as Jerry, the new synths
don't tend to leak, but if they do, just add a bit of Marvel
to them rather than dino. Not that it hurt anything to add
dino. I use the Castrol Syntec as well, it appears to come
up to pressure earlier and also keeps pressure up when crawling
in triple digit heat.
PS. Whoever you are in the Four Corners Area that has been
keeping that damn high pressure area for the past couple weeks
that is making the entire western usa a sauna, feel free to
let it move out any old time....
> Jerry Bransford wrote:
>> "DougW" wrote
>
>
> <snippies>
>
>>> If you did have older cork or small leaks just replace one quart of syntetic
>>> with a quart of dino.
>>
>> Doug, that's no longer needed. Synthetics no longer have that problem since
>> an additive has been present in them for some time that causes the seals to
>> swell just like they did with dino/mineral-based oil. I don't run
>> synthetics myself so I'm not defending them, just passing on what I learned
>> a year or two ago. :)
>
> Interesting. I went with pure synthetic an haven't had any problems. Not sure
> if it's worth the $. Anyhoo, thanks for the info.
Local jeep service manager claims same as Jerry, the new synths
don't tend to leak, but if they do, just add a bit of Marvel
to them rather than dino. Not that it hurt anything to add
dino. I use the Castrol Syntec as well, it appears to come
up to pressure earlier and also keeps pressure up when crawling
in triple digit heat.
PS. Whoever you are in the Four Corners Area that has been
keeping that damn high pressure area for the past couple weeks
that is making the entire western usa a sauna, feel free to
let it move out any old time....
07-29-2003, 12:35 PM
#17
Guest
Posts: n/a
Re: Synthetic Oils Mobile 1 ?
"kevin" <kevin@el.net> wrote in message news:26tVa.8435$uu5.927@sccrnsc04...
> DougW wrote:
> > Doug Jones wrote:
> >
> >>I just bought my JGC at the beginning of the year and it had 84K miles.
I
> >>wanted to switch to synthetic but was worried because I heard rumors of
> >>leaks.
> >
> >
> > That only applies to cork gaskets or engines with real bad wear.
> >
> >
> >>I could not find any documentation or articles to support this,
> >>however. I checked out all of the major manufactures of synthetics
including
> >>Mobil 1 to see what they had to say about using it in high mileage
vehicles.
> >>Every site I checked indicated there are no problems with using fully
> >>synthetic oils in high mileage vehicles and claim that it will not harm
> >>seals, etc.
> >
> >
> > If you did have older cork or small leaks just replace one quart of
syntetic
> > with a quart of dino.
> >
> >
> >>I decided to give Mobil 1 a try since I have heard it is the best
synthetic.
> >>I have been getting it at the local Sam's Club for $25/case and have
been
> >>very pleased. I have noticed less rough idle, easier starts and marked
> >>increase in performance, especially on the take-off. I have had no
problems
> >>in the 10K miles I have put on my Jeep this year and plan to keep using
it.
> >
> >
> > I use Castrol Syntec, but Mobile is good too.
> >
> > I am gun shy of Mobile 1 due the track record of A1, Mobile 1's
synthetic
> Aviation oil which led to many engine failures, and lawsuits. They had
> to remove
> it from the market .
>
I've personally used Mobil 1 in all of my "good" vehicles for many years and
I can say I have had extremely good results with it. I've used it in 5
vehicles including my race car, a turbocharged 4 cylinder Dodge Shelby
Charger, a couple 4x4's, and a heavily modified Chevy 350 in an S10 pickup.
No complaints here.
Chris
07-29-2003, 01:55 PM
#18
Guest
Posts: n/a
Re: Synthetic Oils Mobile 1 ?
From what I know.....
If you use dino oil in your car for many years, the dino oil will get into
cracks and seals and seal up leaks. Then you switch to synth oil, which has
a higher detergent or cleaning factor and it cleans out that dino oil that
used to seal up leaks. Now you got leaks.... I have seen this happen on a
car. A person I know used dino oil to 80,000 miles and then switched to
sythn, the engine started leaking and everything went downhill from there.
Nick
"kevin" <kevin@el.net> wrote in message news:26tVa.8435$uu5.927@sccrnsc04...
> DougW wrote:
> > Doug Jones wrote:
> >
> >>I just bought my JGC at the beginning of the year and it had 84K miles.
I
> >>wanted to switch to synthetic but was worried because I heard rumors of
> >>leaks.
> >
> >
> > That only applies to cork gaskets or engines with real bad wear.
> >
> >
> >>I could not find any documentation or articles to support this,
> >>however. I checked out all of the major manufactures of synthetics
including
> >>Mobil 1 to see what they had to say about using it in high mileage
vehicles.
> >>Every site I checked indicated there are no problems with using fully
> >>synthetic oils in high mileage vehicles and claim that it will not harm
> >>seals, etc.
> >
> >
> > If you did have older cork or small leaks just replace one quart of
syntetic
> > with a quart of dino.
> >
> >
> >>I decided to give Mobil 1 a try since I have heard it is the best
synthetic.
> >>I have been getting it at the local Sam's Club for $25/case and have
been
> >>very pleased. I have noticed less rough idle, easier starts and marked
> >>increase in performance, especially on the take-off. I have had no
problems
> >>in the 10K miles I have put on my Jeep this year and plan to keep using
it.
> >
> >
> > I use Castrol Syntec, but Mobile is good too.
> >
> > I am gun shy of Mobile 1 due the track record of A1, Mobile 1's
synthetic
> Aviation oil which led to many engine failures, and lawsuits. They had
> to remove
> it from the market .
>
If you use dino oil in your car for many years, the dino oil will get into
cracks and seals and seal up leaks. Then you switch to synth oil, which has
a higher detergent or cleaning factor and it cleans out that dino oil that
used to seal up leaks. Now you got leaks.... I have seen this happen on a
car. A person I know used dino oil to 80,000 miles and then switched to
sythn, the engine started leaking and everything went downhill from there.
Nick
"kevin" <kevin@el.net> wrote in message news:26tVa.8435$uu5.927@sccrnsc04...
> DougW wrote:
> > Doug Jones wrote:
> >
> >>I just bought my JGC at the beginning of the year and it had 84K miles.
I
> >>wanted to switch to synthetic but was worried because I heard rumors of
> >>leaks.
> >
> >
> > That only applies to cork gaskets or engines with real bad wear.
> >
> >
> >>I could not find any documentation or articles to support this,
> >>however. I checked out all of the major manufactures of synthetics
including
> >>Mobil 1 to see what they had to say about using it in high mileage
vehicles.
> >>Every site I checked indicated there are no problems with using fully
> >>synthetic oils in high mileage vehicles and claim that it will not harm
> >>seals, etc.
> >
> >
> > If you did have older cork or small leaks just replace one quart of
syntetic
> > with a quart of dino.
> >
> >
> >>I decided to give Mobil 1 a try since I have heard it is the best
synthetic.
> >>I have been getting it at the local Sam's Club for $25/case and have
been
> >>very pleased. I have noticed less rough idle, easier starts and marked
> >>increase in performance, especially on the take-off. I have had no
problems
> >>in the 10K miles I have put on my Jeep this year and plan to keep using
it.
> >
> >
> > I use Castrol Syntec, but Mobile is good too.
> >
> > I am gun shy of Mobile 1 due the track record of A1, Mobile 1's
synthetic
> Aviation oil which led to many engine failures, and lawsuits. They had
> to remove
> it from the market .
>
08-03-2003, 09:21 AM
#19
Guest
Posts: n/a
Re: Synthetic Oils
Engine synthetic is good, keep an eye on leaks and weeps.
Tranny, stay away from syn in the auto's, mixed jury there, some reported
big time problems after the change, others no problems.
The AX-15 requires GL3, NOT GL5 or GL2,3,4,5,6, etc 'one size fits all'
lube. Has to do with sulpher content and the sintered parts that are used
in it. Dealer has a specific GL3 just for the AX15, and its friggin
expensive too... That said I switched to Mobil-1 gear oil in my 98XJ,
5speed, NP231 when it was new, it now has over 180,000mi on it with no
problem but I'm an easy driver, shift very easy, leakage out of my
transfer cases rear seal keeps that area rust free and the underbody well
lubricated. I add about 3oz's maybe every 4 months.
As for a study, I do not know if it is still there but Carnagie Mellon
Univ did a syn study on, IIRC, 6 identical motors. It was interesting
because at the end of the study the engines run on synthetic had no
measureable wear on the parts.
nospam@zero.com (Peter Parker) wrote in news:3f2111a9$1_2@nntp2.nac.net:
> In article <0z1Ua.140033$Ph3.17058@sccrnsc04>, Kevin <kevin@el.net>
> wrote:
>>I run pure synthetics in my TJ. Everything I have seen indicates they
>>are far better than dino oil. It cost me about $6. per quart, but that
>>is cheep insurance for an engine. If synthetic oil can keep jet
>>engines lubricated with the extremely high rpm's they turn , and high
>>operating temps, thats enough to sell me.
>
> I'm new here. I just purchased a used Jeep at wholesale and I normally
> use synthetics in my VW. Mobil 1 for engine oil and Redline for MTF.
>
> The Jeep will be a second car since my VW has 178K miles on it but
> still runs great. I am currently fixing up the Jeep since it also has
> 189400 miles on it but runs very good. I would really like to use
> synthetics in the Jeep but at those miles I am afraid the Mobil 1
> would loosen up the seals and start leaking out. How about synthetic
> in the transmission? I would like to hear if someone has switched to
> synthetic with a high mileage Jeep out there.
>
>
Tranny, stay away from syn in the auto's, mixed jury there, some reported
big time problems after the change, others no problems.
The AX-15 requires GL3, NOT GL5 or GL2,3,4,5,6, etc 'one size fits all'
lube. Has to do with sulpher content and the sintered parts that are used
in it. Dealer has a specific GL3 just for the AX15, and its friggin
expensive too... That said I switched to Mobil-1 gear oil in my 98XJ,
5speed, NP231 when it was new, it now has over 180,000mi on it with no
problem but I'm an easy driver, shift very easy, leakage out of my
transfer cases rear seal keeps that area rust free and the underbody well
lubricated. I add about 3oz's maybe every 4 months.
As for a study, I do not know if it is still there but Carnagie Mellon
Univ did a syn study on, IIRC, 6 identical motors. It was interesting
because at the end of the study the engines run on synthetic had no
measureable wear on the parts.
nospam@zero.com (Peter Parker) wrote in news:3f2111a9$1_2@nntp2.nac.net:
> In article <0z1Ua.140033$Ph3.17058@sccrnsc04>, Kevin <kevin@el.net>
> wrote:
>>I run pure synthetics in my TJ. Everything I have seen indicates they
>>are far better than dino oil. It cost me about $6. per quart, but that
>>is cheep insurance for an engine. If synthetic oil can keep jet
>>engines lubricated with the extremely high rpm's they turn , and high
>>operating temps, thats enough to sell me.
>
> I'm new here. I just purchased a used Jeep at wholesale and I normally
> use synthetics in my VW. Mobil 1 for engine oil and Redline for MTF.
>
> The Jeep will be a second car since my VW has 178K miles on it but
> still runs great. I am currently fixing up the Jeep since it also has
> 189400 miles on it but runs very good. I would really like to use
> synthetics in the Jeep but at those miles I am afraid the Mobil 1
> would loosen up the seals and start leaking out. How about synthetic
> in the transmission? I would like to hear if someone has switched to
> synthetic with a high mileage Jeep out there.
>
>
08-03-2003, 10:01 AM
#20
Guest
Posts: n/a
Re: Synthetic Oils
In article <Xns93CC5DDFA7BFBfistptdnet@204.186.201.17>,
Rich Pierson <fist@ptd.net> wrote:
>Engine synthetic is good, keep an eye on leaks and weeps.
Okay. It's currently not leaking or weeping so it should be okay. I want
to use Mobil1 like I do with my VW.
>Tranny, stay away from syn in the auto's, mixed jury there, some reported
>big time problems after the change, others no problems.
No slush boxes here.
>The AX-15 requires GL3, NOT GL5 or GL2,3,4,5,6, etc 'one size fits all'
>lube. Has to do with sulpher content and the sintered parts that are used
>in it. Dealer has a specific GL3 just for the AX15, and its friggin
>expensive too... That said I switched to Mobil-1 gear oil in my 98XJ,
>5speed, NP231 when it was new, it now has over 180,000mi on it with no
>problem but I'm an easy driver, shift very easy, leakage out of my
>transfer cases rear seal keeps that area rust free and the underbody well
>lubricated. I add about 3oz's maybe every 4 months.
My owners manual states to use only Mopar Gear lub or equivalent
SAE 75W-90 API-GL5 grade. I guess this means that I do not have the AX-15
tranny. I would use Redline MT-90 but it's only 75W-90 GL4 lube. This is
what I currently use in my VW. However Redline does have 75W-90 GL5
synthetic gear oil which fits the specs. I wonder...
>As for a study, I do not know if it is still there but Carnagie Mellon
>Univ did a syn study on, IIRC, 6 identical motors. It was interesting
>because at the end of the study the engines run on synthetic had no
>measureable wear on the parts.
I like synthetic over dino myself. This is my first Jeep even though it's
quite used but it is fun to drive.
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Rich Pierson <fist@ptd.net> wrote:
>Engine synthetic is good, keep an eye on leaks and weeps.
Okay. It's currently not leaking or weeping so it should be okay. I want
to use Mobil1 like I do with my VW.
>Tranny, stay away from syn in the auto's, mixed jury there, some reported
>big time problems after the change, others no problems.
No slush boxes here.
>The AX-15 requires GL3, NOT GL5 or GL2,3,4,5,6, etc 'one size fits all'
>lube. Has to do with sulpher content and the sintered parts that are used
>in it. Dealer has a specific GL3 just for the AX15, and its friggin
>expensive too... That said I switched to Mobil-1 gear oil in my 98XJ,
>5speed, NP231 when it was new, it now has over 180,000mi on it with no
>problem but I'm an easy driver, shift very easy, leakage out of my
>transfer cases rear seal keeps that area rust free and the underbody well
>lubricated. I add about 3oz's maybe every 4 months.
My owners manual states to use only Mopar Gear lub or equivalent
SAE 75W-90 API-GL5 grade. I guess this means that I do not have the AX-15
tranny. I would use Redline MT-90 but it's only 75W-90 GL4 lube. This is
what I currently use in my VW. However Redline does have 75W-90 GL5
synthetic gear oil which fits the specs. I wonder...
>As for a study, I do not know if it is still there but Carnagie Mellon
>Univ did a syn study on, IIRC, 6 identical motors. It was interesting
>because at the end of the study the engines run on synthetic had no
>measureable wear on the parts.
I like synthetic over dino myself. This is my first Jeep even though it's
quite used but it is fun to drive.
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