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04-28-2015, 12:34 PM | #1 |
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New differential oil
Hi,
I own M3 E92 2008. Recently, there were broken bearings on the rear differential, and I ordered a new differential. I plan to first oil change at 2000 km. Is it necessary to use expensive BMW oil with FM booster or it's not necessary? |
04-28-2015, 12:48 PM | #3 |
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04-28-2015, 01:35 PM | #4 |
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I wouldn't use the FM crap unless you have excessive chatter. Groaning is normal and welcome as a diff noise.
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04-28-2015, 01:40 PM | #5 |
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I used the expensive FM crap but only because I got a free diff flush out of the deal. Diff still groans but hard to tell how much if less it has subsided.
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04-28-2015, 01:58 PM | #6 | |
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Everything is done for a reason, BMW obviously picked the FM booster for a reason...
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04-28-2015, 02:06 PM | #7 | |
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04-28-2015, 02:24 PM | #8 | |
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So this FM boosted fluid was not intended. Most diff builders will tell you it reduces locking which is what you do not want. |
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04-28-2015, 02:36 PM | #9 |
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What those guys stated. Folks complained about groaning coming from such an expensive car, even though the groaning was a good sign of a working limited slip diff, and BMW came out with a "silencer', that allows more slip. I've never used it on my past 4 M diffs.
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04-28-2015, 02:53 PM | #11 |
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What problems?
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04-28-2015, 02:57 PM | #12 |
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04-28-2015, 03:02 PM | #13 |
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The diff is a wear item, were your other diffs open or limited slip? I've never had one last to 100k as a limited slip without clutches needing replacement.
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04-28-2015, 03:10 PM | #15 |
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I am running the regular non-FM fluid. I had some diff chatter before and the dealer but in the FM fluid. The chatter went away. At my next diff service interval, I switched back to the non-FM fluid and it's been fine.
The chatter is normal for clutch type LSDs. Adding the FM fluid reduces the performance of the diff when it tries to lock. It's not necessary if your diff is not making noises. Even if it is, go do some performance driving and the noise will go away once the diff warms up. Only the M models cars like the M3 has an LSD. It adds performance to the car. The regular models don't have it. Probably because normal people wouldn't use the performance anyway. Saves BMW money.
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04-28-2015, 11:51 PM | #16 | |
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