E46Fanatics - View Single Post - Changing diff fluid. Oem or not?
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Old 05-28-2012, 11:41 PM   #2
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Join Date: Dec 2011
Location: Clarkesville, Georgia
Posts: 37
My Ride: too many to list
Alot of M3 owners put Royal Purple in the Diff. Depending on your driving style, either 75w90 or 75w140......Climate has some impact on weight as well. The hotter, the thicker. I live in the south, so I went with 140
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