Who's running synthetic in their diffs?

[shonuff]

Any problems?

[addicted]

Been running it in my '04 GC for over 100k with no problems. Which reminds me I need to place an order with Amsoil for more.

GM uses it in all theit trucks and has since around 2000 or so.

[MuleRider]

What weight? I have a friend that does that but I haven't bothered to ask him. He has an 83 Cherokee
Been running it in my '04 GC for over 100k with no problems. Which reminds me I need to place an order with Amsoil for more.

GM uses it in all theit trucks and has since around 2000 or so.

[shonuff]

I've had it in the axles of my XJ for about 4 years now with no issues there either, but I wasn't sure if the seals of these older axle models responded differently.


A difference seems unlikely I guess, but thought I'd ask.

[fulsizjeep]

I have been running Royal Purple in my axles since 2003. It lubes so well, when the rear bearing let the LR axle fly last year, I never heard it growling.

[PlasticBoob]

I use Mobil-1 in my FSJ, performs beautifully and has zero leaks. Been running synthetic since 2003 or earlier.

[mattmopar440]

Due to the LS unit I have to Run Syn or a additive

I run Mobil1 best oil for your money :thumbsup:

[710 Burner]

Unless he changed it, Lyndel is running Valvoline 85-140 full synth with friction modifier for the LSD in the rear of the '87.

[tyrodtom]

I run Mobil 1 in the rear end ( and transmission and engine) in my J10 since 2003, my circle track Nissans since 1999, and my Jetta since 2005,no ploblems.

[newtojeeps]

I put Valvoline Syntech 75-90 in my diffs. pinion seal started acting up in one the other is fine.AMC 23's

[joe]

Redline 75w-140 works well.

[Serious Johnson]

For about 6 years & 25,000 miles I've had Redline 75w90 in the front D44, and 80w140 in the rear AMC 23 (heavier stuff back there because of towing) -- limited slips in both diffs. Redline D4 ATF in the NP 208, and Redline 75w90NS (no limited slip modifier) in the T-18. Mobil-1 5w20 or 0w20 in the 360.

I've used Redline gear lubes in different vehicles for several hundred thousand miles, and have had good service with them -- stuff lasts practically forever.

S.J.