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06-11-2014, 09:19 PM | #45 | |
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Service Bulletin number for this issue??
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In my experience, it is best to be able to provide the Technical or Service Bulletin number to the service writer on an issue where one has the BMW heads up on it. |
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10-13-2014, 03:50 PM | #46 |
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Curious if anyone has got the new fluid with the friction modifier and it didn't resolve the issue?
I have about 300 miles on the new fluid with the FM and so far no improvement at all. In fact the car actually seems to be making the noise more often and louder. I've done the circles thing multiple times as well. Going to do a short road trip just to get the rest of the miles in so the dealer will look at it again. |
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10-14-2014, 06:38 PM | #47 |
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Ha. That's nice it's only the fluid. I wasted my diff. Now have OS Giken. No more peg leg or stability control intervention
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F80 M3 HRE FF04 275/305.
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10-16-2014, 03:18 PM | #48 |
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what spec of the osg?
the non-locking stock setup or something improved? |
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10-16-2014, 03:32 PM | #49 |
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Spec? I don't know the shop ordered it. It's tuneable and they changed the setup a few times. It's night and day. My stock LSD was garbage. It's a completely different animal.
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10-17-2014, 01:58 PM | #50 |
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they'd changed the setup a few times?!
very interesting! so they had a testdriver try it and then took it out, changed the setup, tried again and so on? so what setups did they try and what was the according result? i'd be VERY interested in their findings... that the stock unit is garbage is nothing new to me... but a proper working os giken would indeed be a new thing to me! ;-) |
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11-28-2014, 12:21 PM | #51 | |
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11-29-2014, 03:05 PM | #53 | |
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I will say your foreman is correct, it is normal and has occurred with every M diff I've owned, when it's cold. I've never used any of the FM boosted stuff as it takes away from the locking differential job. It's only for people who don't know any better and think the car will fall apart due to the noise.
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12-02-2014, 01:09 PM | #54 |
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Took mine in for the fluid change today and the only difference so far is that I'm $245 poorer than when I dropped it off. The biggest rip off since the Pet Rock.
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12-02-2014, 01:10 PM | #55 | |
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I run Royal Purple, just changed the rear diff fluid, no noises, and only about 15 $ a bottle. |
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02-26-2015, 04:41 PM | #56 |
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I bought my car 2 months ago and have been experiencing this issue. It's an 08 manual m3 with 43k miles on the clock. I was just wondering whether there has been any issues with not changing the fluid? as this thread seems to date back to 2012. I can live with the noise and an extra $245 bucks in my pocket (that I would save from dealer diff fluid change) but am just really worried about it damaging the diff in the long run?
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05-11-2016, 05:04 PM | #57 |
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Resurrecting this thread again because after doing a bunch of research on LSD friction modifiers looking into what to put into my GT4, I've gotten confirmation from several sources of what I had already suspected, namely that these FM boosters are purely for NVH and they accomplish their goal (reducing noise) by reducing the effectiveness of the diff.
If you look at Red Line's own product pages, for example, for the versions of their products that have friction modifiers, they say that they "provide additional slipperiness", which is exactly what you DON'T want if you want an LSD to actually do its job rather than just sit quietly in your driveline. Matt Monson of Guard Transmission, a very well-respected vendor of custom diffs and custom MT gears for Porsches (and maybe other makes?) also confirms that these friction modifiers reduce lockup. And yes, I'm aware that Red Line specifically recommends the non-NS version (i.e. the one with friction modifiers) for M car diffs, which I assume is because the NS version that lacks them might be TOO harsh for this application, but my point is that having more friction modifier than is actually needed for the diff to do its job will be detrimental to performance, and that's what BMW did to their own diff oil when they created the +FM booster version in response to customer complaints about noise. I stayed away from the +FM version of the diff oil because it seemed strange to me that it was made by BMW off of a Castrol formula (whereas the original version was an unadulterated Castrol product), it was only listed as an option in the US rather than globally, and it was only available upon request from customers who complained about noise -- even though the original XJ and the XJ +FM versions cost basically the same from the dealer, at least when I checked. If the +FM version had been an overall improvement, I'd have expected it to be listed globally and just have become the standard fill going forward. So I guess if you drive your car in a way that doesn't take advantage of an LSD, then by all means go with the +FM version, but if you're driving the M3 as intended, i.e. adding throttle mid-corner (especially at the track), then deal with a bit of noise in tight corners when the driveline is cold in exchange for better performance.
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