Rear Differential Noise When turning at Low Speed
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05-17-2009, 03:06 PM
Drives: E90 335i & C6 Grand Sport
Join Date: May 2009
Location: Santa Barbara
Alright, I have an answer to our questions. The "special" oil (83 22 2 282 583) is described on the bottle as "SAF-XJ + FM Booster". So, it is the same oil with the addition of some type of extra friction modifier or "booster".
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