hey my buddy has that new dodge rig,(2008) what does dodge run for oil in the diffs? im a ford boy so its always been 80w90 gear oil for me but im gonna change the oil and i was wondering what they run in them synthetic maybe or something, anyone knows that would be awsome, i heard if you run the wrong stuff they give you hell about warranty thats why im asking.

 

Severe duty, go with 75w-140, light to medium duty, go with 75w-90

As far as the brand, Royal Purple is good, also got Amsoil and Valvoline.

 

I was told today use a synthetic for warranty purpose from dealer also needs to be changed every 15 to 20,000

 

i use mobil one and lsd additative

 

Yep, everything is synthetic on the diffs and have been for a while. 75/90 is what's called for. The 110 or 140 if really pushing it. I thought Ford was requiring 75/140 now on the late models as they were losing rear ends on the 90...or have they fixed this issue??

 

Does the differentials oil need to be changed like the dealer said at 15 to 20,000 miles? Useing syn they should not need it that often in my opinion.

 

It is a good idea to change it out between 5-10 actually. It gets the initial wear metals out. Then once you changed that, you're good for quite a while. With ours it's 50-100k depending on use(typically 50)

 

Thanks for the information I will get it changed