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      12-14-2011, 06:03 PM   #33
Papethova
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Drives: '08 135/ '11 1M
Join Date: Oct 2007
Location: at Death Valley 127

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Quote:
Originally Posted by flzrider View Post
Exactly my point. Since we are not sure on the answer to those questions shouldn't we err on the side of the service bulletin?
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.