Quote:
Originally Posted by CarJunkie
Why not go to the dealer and get the right fluid from BMW?
From what I have read, the friction modifier takes the noise away, but does not benefit the diff in any other way. Without the FM, there will be audible sounds from the diff that may be disturbing to some drivers, but are not a sign of malfunction.
FWIW, I used RP 75w140 with FM in the rear diff of my RX-8 (torsen-type LSD) and it solved a lowspeed shudder that occured when turning at full luck in reverse (ie backing out of a parking spot). That had developed with the original factory fluid. I can't say whether it was the RP fluid or just changing out the break-in fluid that made the difference.
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yea definitely want to run something with a friction modifier on vehicles with LSD. royal purple will work but like he said cant go wrong with the factory fluid. now going against what I said, what can I run as far as aftermarket fluid for a 135i with no LSD??