Which gear oil?

[boomchadda]

I have a 2006 ram 4x4 and need to change the oil in the front and rear diffs. I dont know which one I have to use? 75w-90 or 75w-140 or 85w-140? And also which one do you recommend Amsoil or Royal Purple? Thanks.

 

[05mxdiesel]

Manual says 75w90, but if your doing some serious towing all the time I would step it up to 75w140. I recomend Amsoil but any syn gear will do the job under sane intervals. If you use Amsoil, go for the new 75w110.

 

[RDyson]

I use Amsoil 75/110 in mine. I don't tow very much and don't need the heavier oil for that. But this one will help out for when I do tow.



Randy

 

[JCasper]

I am running the the 75W-90 Amsoil in mine. I was going to go to the 75W-110 but I had the 75W-90 on my shelf and needed to use it up.

 

[amsoilman]

I have a 2006 ram 4x4 and need to change the oil in the front and rear diffs. I dont know which one I have to use? 75w-90 or 75w-140 or 85w-140? And also which one do you recommend Amsoil or Royal Purple? Thanks.

I would go with the 75W-90. Here is a link to a very good study of "Gear Lubes"



AMSOIL - A Study of Automotive Gear Lubes