I had originally just wanted to check the fluid level to see if that was an issue, but I went ahead and picked up some manual trans oil specific to my E90 M3 at the dealer when I grabbed the trans plugs to replace my stripped ones, then swapped it out. They had the car for a day, drove it a bunch, and their first suggestion was to change the trans fluid back to the BMW specified fluid to see if that helped. Since the noise was getting worse, I left my car at my other friend’s shop where the clutch work would be done if needed. Soooo, I pretty much accepted the fact that I would have to rebuild my clutch, as replacing the throw out bearing is so labor intensive that I may as well do the whole f*ing clutch while I’m in there (especially considering the miles on the car). ![]() Based on what I was experiencing, it was determined that the sound was coming from a stressed bearing, and it was further determined that it was likely the throw out bearing in my clutch. After the weather turned cold a few weeks ago however, (not sure if this is related or coincidental) I noticed a distinct high-pitched kind of whining noise that was definitely associated with either clutch or trans (as it only appeared when the car was in gear and driving - never while idling, it got worse as the rpms increased, and it immediately disappeared when I pushed in the clutch pedal to change gears and it was nonexistent while coasting in neutral). ![]() Shifting felt AMAZING after swapping out the fluid, and I had no issues for months. Per the advice from a very knowledgable friend who owns an indie shop in GA I used Redline D4 ATF fluid instead of the BMW specific trans oil. One of the things I did not too long after purchasing my car was change the trans fluid. Also interested in any input from other people using this fluid, or really any other experiences people have had. Kind of a long story, but since it looks like we maybe solved a problem I was having with my transmission, I felt it was worth sharing.
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