which Diff. oil?

[machinemover]

Just got my Mag hytech cover today. I pull alot. Should I use 90w-140 synthetic probably go with amsoil or stick with the 75w-90 like the book says?

 

[amsoilman]

I use the 75W-90 Series 2000 Amsoil in differentials, and find it to be A OK. Have also used this in my other two CTD trucks.



Wayne

amsoilman

 

[lschultz]

I guess it depends if you are going to be hauling/pulling a lot of weight any distance. I have always used the 75W90 in the past. But when we get a 5th wheel I will probably go with the 75W140. Just something to think about.

 

[Bob Wagner]

machinemover since you tow heavy its a must to go with the 75w-140

 

[machinemover]

I was thinking the 75w-140 also since 95% of the time I tow heavy. Besides I already have a few qts. of Amsoil in the garage.

Thanks, just wanted another opinion.

 

[dieselpilot1969]

I went with royal purple in front and rear diffs, good stuff, not sure really who is best but I am sure this is right up there with them imho

 

[Steve M]

Valvoline full synthetic 75W-90 in mine. If Valvoline is good enough for the engine factory fill, I'll have to believe it's good enough for the AAM rear end. I've seen no proof that there's any better.

 

[y-knot]

i DON'T CARE WHICH WEIGHT YOU USE, JUST USE THE AMSOIL.

 

[amsoilman]

SteveM,



Here ya go





http://amsoil.com/performancetests/gearlubetest.htm

 

[crabjoe]

Originally posted by amsoilman

SteveM,



Here ya go





http://amsoil.com/performancetests/gearlubetest.htm

I gotta believe that the test was a comparison of Amsoil synth vs Valvoline Dino gear lube.



Anyone got a test that's similar but synth vs synth?

 

[radar doctor]

Information

Thanks for the info guy's now i know what to get. .

 

[Steve M]

I second Crabjoe's assessment. That's not proof. It's an advertisement.