Which Diff Oil. -Dodge Ram Diesel

Joined
Nov 29, 2015
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SoCal
Got 2009 Dodge Ram QQTD 4x4 with AAM 9.5 up front & 11.5 rear differentials with stock covers, pretty sure oem is 75/90 GL5, no LS additive

It's time for a differential oil change and could use some info on which oil is best? I tow a 10k load about 3k miles a year....so which of these is best and why?

1) Redline gear oil 75/90 or 75/140
2) Mobil Delvac 1 gear oil 75/90 or 80/140
3) Amsoil severe gear 75/140
4) Schaefer (they got a bunch, not sure which one)
5) Shell Spirax 75/140

Please no "I've used XYZ oil forever and had no problems", I've at already read all of those threads and I'm looking for more detailed info on one of these VS the other(s) to see which ones best to run.

Thanks
 
Joined
Mar 2, 2013
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The Midwest
It wont matter. Pick the one that suits your fancy. Most of the time with threads like these, the OP wants someone touting the same fluid that is already at the top of his list.

In the real world, Mobil and Shell are used by trucking fleets extensively and do their job well. The other name brands minus Schaefer to an extent, are boutique fluids with lots of marketing behind them.

I'm a UPS semi mechanic and we are using Delo at my hub and it works.
 
Joined
Sep 26, 2010
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I use Amsoil as it is arguably the best on the market. 75W-110 in the front axle and 75W-140 in the rear. There should be some of my UOAs out there somewhere (2010 FX4, 2015 F250, 2019 Jeep).

Out of curiosity, @2009ram2500 where are you finding Shell Spirax 75W-140?
 

2009ram2500

Thread starter
Joined
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My top two are Delvac VS Redline what's better?

Also isn't Redline Ester based vs what's Delvac?

Thanks
 
Joined
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I'm running Redline in my AAM 4.10 geared 11.8 with factory finned Al diff cover. Mostly because I've seen it perform well in very extreme conditions, and that I get it cheaper than any other brand doesn't hurt.
 
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