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In 3 years I've seen about 20 failures. The latest model was an 08 boxster with 60K. I had an 05 with 19K on it that was failing. And it was curious that in the records the dealer fixed the ims seal at 9K. This I believe was due to fretting wear from vibration of the failing ims bearing.
It is also curious that the front ims bearing under the oil pump never fails. Clearly it seams that the loading from 2 chain drives has an effect on the failures.
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