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      12-14-2011, 06:11 PM   #35
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Drives: N54 e82
Join Date: Feb 2010
Location: Bayern, Germany

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Originally Posted by Papethova View Post
Well.... do you think adding FM adds any protection to the diff?

I guess thats what it comes down to. My belief is it increases the friction in the diff so it will prevent the chatter at low speeds. That to me means it keeps the thing from working the way it was intended to. Im a chemist not an engineer so maybe someone else can chime in here but I do know that the VPC claims they used the non FM fluid when they did my 1200 mile service.

Actually... I think the +FM is more slippery (than SAF-XJ) - to allow for more slip and less noise from the diff's clutch discs.