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Old 08-03-2010, 06:12 PM   #6
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Join Date: Apr 2008
Location: Boston
Posts: 4,971
My Ride: 2003 325xi
Originally Posted by swn80 View Post
2. The dealer told me that front and rear differential fluids are different.
Whoa. Really? That's interesting.

I use Redline 75w-90 in my diffs and D4ATF in my TC and MT.

I had a front diff for sale, and I was shocked how many people with automatics contacted me after their front diffs failed. I asked a tech from TMS and he confirmed that they leak, and they will fail obviously. He said they usually leak around the INPUT seal.
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