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I hate this IMS failure issue. It bugs me that Porsche doesn't do anything about it, and it's like a time bomb sitting in the engine. I just dropped $15K on an 03 986 and I would probably not have done so had I looked more into this IMS issue before purchasing (this is my second Boxster and it was less of a well known issue five years ago).
That being said, my strategy is as follows:
1. Frequent oil changes, and tear up the filter each time.
2. Magnetic drain plug, check carefully.
3. Run the Durametric check each Saturday comparing Cam variance 1 and 2 and make sure they are still solid.
I have a Tiptronic S, so there's no regular clutch job to provide an excuse to to the IMS bearing retrofit.
While this is now a well known problem, the number of failures taking place appears to be well less than 10% of the users on this board who were surveyed. That to me doesn't justify $3K out of pocket to pro-actively replace the bearing.
Interested to know what others think.
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