Quote:
Originally Posted by Bristol
I think it just depends on how bad the bearing seals are to let oil in. It seems to vary from car to car when they remove the bearing and find oil in the shaft. In my C4S that I just did last weekend the seals on the bearing looked fine, but when I removed it I found that the shaft had a significant amount of oil in it, a lot more than what I've seen in other posts.
Kirk
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Kirk,
I noticed in your most excellent Tune RS DOF install thread that the seals on your old bearing looked good, but that there was no grease and only a bit of oil in the bearing. It seems to me that this is a typical situation. Most bearings appear to loose their grease and take in oil even when seals appear intact.
My point to this thread is that if the IM shaft has oil in it, then the bearing will be bathed in oil when the car is parked nose-up (Boxster). If the car is parked nose-down, the oil will drain to the other end of the shaft leaving the bearing high and dry, especially if the car is parked for long periods of time. I am not completely sold on the high versus low RPM theory. There may be something there but I don't think it has to do with loading of the bearing. Probably higher RPMs throws more oil on the bearing