Looking to change out my rear end's gear oil, what brand? DC's gear oil seems a bit spendy!
Possibly considering?
Royal Purple
Redline

 

I went with Royal Purple 75w-140. So far no complaints.

MikeyB

 

Mobil One 75W-90

 

Amsoil 75w-140 synthetic in the truck.
I have Amsoil in everything and the guy who sets up my race car ring & pinions loves it too!

Amsoil source/locator

 

Mobil 1 75W90 here. Easy to get and good quality.

 

another one for Royal Purple 75-140. good stuff

 

My rear end went south using DC stuff. Now using Redline 75W140 for towing and no issues so far. I will be taking a 3000 mile trip next month so that will be a good test.

Casey

 

Valvoline Full Synthetic 75W90 GL5.
Greg

 

Thanks,
they all are name brand products. I will be going shopping this afternoon.

 

Valvoline Full Synthetic 75W90 GL5....good stuff

 

Royal purple, since changing I have picked up 1.5 mpg overall driving,

 

Mobil 1 75W-90 for me. I had AMSOIL 75W-90 in it and was warned about it prior to use. Used it anyway and experienced gear chatter. If you insist on AMSOIL, put some additive in it, but AAM specifically states not to use anti slip additive. So, out with AMSOIL and in with Mobil 1.....have not had any problems since......great stuff and readily available in your local auto and department stores.


I hear AMSOIL 75W-140 does not produce the chatter however, I personally do not want to use that particular grade gear oil for my application......not saying anything is wrong with 75W-140, just saying 75W-90 is what I want to use. Also, lost confidence in AMSOIL after my experience.

I am not flaming AMSOIL!!!!! Just my bad experience with it in the differential......others have experienced the same thing. I still use AMSOIL in my motorcycles but I'm switching over to Mobil 1 V-Twin next change.

Just my .02 for what it's worth.

 

Mobil 1 75w90. I had amsoil series 2000 75w90 and it made noise going around corners, stunk to no end, and left my diff dirtier than the original fluid or subsequent changes of m1. Not to mention the fact that the m1 is compatible with our warranties, I'm sticking with it.

 

Sounds like mobil 1 75W-90 it is. I cant seem to find royal purple or redline in my area. I know, order it. I can't see the need to order it, then wait 3-5 days for delivery. Comes out to be the same or more cost wise if shopping local.

 

I am about to change mine out too, for the first time. I am trying to make a decision on which one to use. Sounds like this thread is leaning toward Mobil 1 75w-90.

Ok, im not mechanic here......so can somebody tell me what the difference is in the 75w-90 vs 75w-140? Is the higher number, "better" for some reason?

I just got my Mag-Hytec rear diff cover today so in a few days im making the switch.

Is there any other to consider besides Mobil 1, RP, Redline, and Amsoil?