Quote:
Originally Posted by RobertKing
My 2001 Boxster S has 111,000 miles on her. If, IMS failure was going to happen, it happened long ago and I've no record of that from past owners. There was an issue early on. An issue so severe that there was a class action lawsuit. But, most of them happened below 40,000 miles. If you drive a Porsche like a Volvo expect problems.
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The most likely failure mode begins when IMS seals degrade to the point where the bearing grease washes out but not enough splash oil gets in to lubricate it. Seals in low mile cars, whose seals sit in contaminated oil for long periods, see this mode early on.
Seals in high mile cars with frequent oil changes degrade much more slowly, which gives rise to the myth that once you past a certain point your IMS won't fail. Nevertheless, they still degrade. Eventually, these cars will see their IMS bearings fail. For this reason, one should change the bearing at the time of a clutch changes and leave the outer seal off.
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