BMW M3 Forum (E90 E92) - View Single Post

Z K · 08-21-2012, 03:47 PM

You only need the FM (aka Friction Modifier) booster if your diff is making grinding noises. All it does is make the noises go away. Otherwise you can use the regular LSD diff fluid which is a lot less expensive.

08-21-2012, 03:47 PM	#17
Z K Major General 1887 Rep 5,506 Posts Drives: E90 M3, G20 M340i Join Date: Jul 2011 Location: San Francisco iTrader: (3)	You only need the FM (aka Friction Modifier) booster if your diff is making grinding noises. All it does is make the noises go away. Otherwise you can use the regular LSD diff fluid which is a lot less expensive.
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