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From late ‘05 through the early gen 1 997 engines of ‘09, the IMS is the larger, non-serviceable type. The good news is they have a high degree of reliability for normal driving. The failures on these bearings comes with regular track duty.
Either way, you want frequent oil changes. At least every 3-4K or annually.
My ‘06 Cayman(same bearing) has just over 100k and oil analysis shows good numbers for wear. Having said that I know it may not be an IMS predictor that I can rely on, but it gives me some info on engine health.
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