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      12-14-2011, 10:54 AM   #28
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Drives: 1M
Join Date: Aug 2011
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Originally Posted by flzrider View Post
So is there any reason not to use the FM diff. fluid at the 1200 mile service? It seems like the service bulletin states pretty clearly that the new operating procedure is to use the FM fluid. I just find it strange that they would use non-FM fluid at the factory but then require the FM fluid immediately after.

And, as always, Dackel comes through with tons of helpful info.
I'm under the impression that the +FM is used if there is noise coming from the diff, and that once you put FM in there you can't go back to non-FM. My bias would be to just go with non-FM unless I hear bothersome noise. I'd be curious to hear what people think?