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| increasing diff change interval http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=76957 |
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| Author: | rueffy [ Sat Oct 05, 2013 5:45 pm ] |
| Post subject: | increasing diff change interval |
Wondering if anyone running synthetic gear oil in the front and rear diffs has increased their change intervals. I just dumped the oil between 20,000km changes and it looked spotless. Considering the price of synthetic should we be increasing our intervals? Also I never noticed before a discrepancy between the shop service manual and the owners manual. Shop manual specifies standard gear oil (non-synthetic), owners manual specifies sythetic (just talking about the 75-90 here, not the upgraded towing grade oil). Cheerio Brett Langley, BC |
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| Author: | tjkj2002 [ Sat Oct 05, 2013 6:59 pm ] |
| Post subject: | Re: increasing diff change interval |
Syn gear oil requires sooner OCI's then dino gear oil.They only use syn gear oil for that 0.1 extra mpg's it gives to meet federal mpg standards but actually is not the greatest in your diff to make it last,hence the sooner OCI's.Just slpa some dino gear oil in it(85w-140 for towing or offroad) and your diff you love you and so will your wallet.Most top end axle builders for high dollar offroad axles(Currie and Hi9) only recommend dino gear oil and many car makers are actually switching back to dino gear oil like there moving away from timing belts(starting to learn there lesson). This only goes for gear oil not engine oil or trans oil due to how the diffs are oiled. |
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| Author: | MRausch82 [ Sat Oct 05, 2013 8:00 pm ] |
| Post subject: | Re: increasing diff change interval |
I've run synthetic gear oil in my diffs in many different vehicles, sometimes with 100K change intervals due to laziness, and not a single failure... YMMV. I see nothing wrong with synthetic oil in them. There are some differential manufacturers that advise against it due to the limited slip aspect... our Jeeps are not one that advise against synthetics. I'd say change it every 60K with a good synthetic oil and it'll be fine. I did mine around 60K and used a LubeLocker gasket on the rear diff, and will change again at 120K. I used Mobil 1 75w140 in the rear and 75w90 in the front, and ATF+4 in the transfer case. At 120K I plan to change with the same weight except I will likely use Pennzoil synthetic since I stock mainly Pennzoil/Shell products now. |
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| Author: | thermorex [ Sat Oct 05, 2013 11:24 pm ] |
| Post subject: | Re: increasing diff change interval |
I use also syn oil, 75w140 on both Cherokee and crd and replace it at 50-ish k. Looks like new, but lately I didn't go offroad too much either. I think you can do 100k easy without towing and/or offroading. |
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| Author: | CATCRD [ Sat Oct 05, 2013 11:49 pm ] |
| Post subject: | Re: increasing diff change interval |
I also use synthetic in both of my CRDs. 50k miles is no problem. |
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| Author: | Brianawd [ Sun Oct 06, 2013 5:00 pm ] |
| Post subject: | Re: increasing diff change interval |
Just run what works for you. I have run nothing but synth in all for my diffs for years. I put over 80k on my old landrover discover that was lifted locked and geared on 35s. When I sold it to my friend I helped him change all the fluids. And check the diffs. They looked like the day I put them in. |
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| Author: | DOC4444 [ Sun Oct 06, 2013 6:38 pm ] |
| Post subject: | Re: increasing diff change interval |
The Chrysler 8.25 is a pretty delicate diff. We have gone through 3 whole R&Ps in 100K miles (on Chrysler's nickel). I had to run Chrysler synthetic in order to maintain the 100K warranty, but now that it is on me, I switched to SWEPCO 212. This is really the ultimate hypoid oil. It is a petroleum based, 80W-140, with moly that does not require a friction modifier for use with clutch type LSDs. Synthetics are great for almost all applications except hypoid gears. They lack the shear strength of dino. (A little known secret is that Penske has been putting SWEPCO 203 in their Mobil 1 gear oil bottles for over 30 years.) Our Jeep has never waded through water. When I switched to SWEPCO, there was only about 25K miles on the mopar synthetic and it was already black. However, this may reflect clutch material from the TrakLok diff. Bought a TruTrac to install shortly, so no clutches to wear out, going forward. DOC |
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| Author: | Drewd [ Sun Oct 06, 2013 8:00 pm ] |
| Post subject: | Re: increasing diff change interval |
My front diff fluid lasts twice as long as my rear diff. Synthetic oil in diffs = shorter intervals. Use conventional gear oil, your diff's and wallet will thank you! |
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| Author: | rueffy [ Sun Oct 06, 2013 10:11 pm ] |
| Post subject: | Re: increasing diff change interval |
thanks for the replies folks....decided to go back to regular gear oil......lots of different opinions here - if there are conflicting reoprts I tend to just go with the spec...... |
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| Author: | MRausch82 [ Sun Oct 06, 2013 11:13 pm ] |
| Post subject: | Re: increasing diff change interval |
rueffy wrote: thanks for the replies folks....decided to go back to regular gear oil......lots of different opinions here - if there are conflicting reoprts I tend to just go with the spec...... Spec, at least as per Chrysler, is synthetic for our Jeeps. |
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| Author: | tjkj2002 [ Mon Oct 07, 2013 6:03 am ] |
| Post subject: | Re: increasing diff change interval |
MRausch82 wrote: rueffy wrote: thanks for the replies folks....decided to go back to regular gear oil......lots of different opinions here - if there are conflicting reoprts I tend to just go with the spec...... Spec, at least as per Chrysler, is synthetic for our Jeeps. That's not entirely true. |
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| Author: | Hexus [ Mon Oct 07, 2013 6:30 pm ] |
| Post subject: | Re: increasing diff change interval |
FSM says: Front Axle 186FIA (Model 30) - Mopar Lubricant 80W-90 Rear Axle 8 1/4 - Mopar Gear Lubricant 75W-90 (Trailer Towing - Moopar Synthetic Gear Lubricant 75W-140) Note: Trac-lok equipped axles require 118ml (4 oz) of limited slip additive be added to the lubricant. |
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| Author: | ATXKJ [ Mon Oct 07, 2013 10:15 pm ] |
| Post subject: | Re: increasing diff change interval |
We had this discussion a while back - Currie - the company that makes high performance diff/axles - will not warranty anything that's had synthetic oil used on it - they specify regular gear oil only. I called tech support to ask why and the only real answer was - experience - diff's die with synthetic oil - and live with regular - so they changed their warranty policy. Not sure how well that translates to the street - but I switched to regular oil. (and my Camaro's been running dino oil forever - no problems with it) |
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| Author: | tjkj2002 [ Mon Oct 07, 2013 10:32 pm ] |
| Post subject: | Re: increasing diff change interval |
ATXKJ wrote: We had this discussion a while back - Currie - the company that makes high performance diff/axles - will not warranty anything that's had synthetic oil used on it - they specify regular gear oil only. I called tech support to ask why and the only real answer was - experience - diff's die with synthetic oil - and live with regular - so they changed their warranty policy. Not sure how well that translates to the street - but I switched to regular oil. (and my Camaro's been running dino oil forever - no problems with it) X2....................... Why my $4000 Currie RockJock60 get's filled with dino 85w-140. If any one's looked at Hi9's website it's pretty apparent they do not want synthetic gear oil used and those are some hi priced diffs(nice though). http://www.truehi9.com/oilingsystem2.html |
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