Originally Posted by Sean05
mine never made noise but still opted out for the friction modifier which is a lot compare to the regular..
ALSO FYI if you guys are interested on 15 bucks a bottle contact MERC... they have it without the Friction Modifier for less than half a bottle compare to BMW...
Yeah, BMW also has a non-FM boosted LSD diff fluid. Much cheaper than the FM booster version. Dunno the part # off the top of my head.
The FM-boosted version has more FM in it for people who complain about diff noises. Most of the time the noise is because people drive the cars too conservatively and don't break in the differential.