Can't use diff oil in it, has brass syncros and the sulfer in diff oil corrodes them. Have been using rotella strait 30 that is also speced for transmission use also cause the factory part number for fluid is 10w30 motor oil. Owners manual is a misprint, it says 75 90. About due for a change and thought I would try redline since it's esters based (true) sytheteic.
We use Redline MTL in the German cars and it really improves shifting, especially when cold and reduces noise. Some of the BMW V8 6 speeds are notorious for balky shifts and Redline straightens that out.
I'm a believer in their products. They make great diff oil for heavy applications too. I use their Shockproof 75W250 in my Cummins diffs and have not had any issues. Reduced gear noise in my current truck noticeably.
