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Differential fluid capacity?

31K views 6 replies 5 participants last post by  peete  
Dredging up this thread. I'm replacing the dif oil this weekend in Rusty the ZHP. I have Redline 75w90 and 75w140 in the garage. ZHP is my wife's daily but I am autoxing it sunday since my E30 is broken.
Is the 75w90 fine? I save the 75w140 for her M3 and my E30.