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      03-03-2013, 10:08 AM   #9
MilehighM3
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Drives: E90 M3
Join Date: May 2011
Location: Colorado Springs

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Quote:
Originally Posted by edwinm3
They will only use the fluid it calls for which is the one that has the FM booster additive.
This is wrong. The FM booster is the only oil to be used in all M differentials for normal maintenance. It's been that way for almost 3 years now. If your car doesn't have it, the last dealer to service it used the wrong fluid.