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Welcome to the board. Firstly, you need to do more research on your own. Check out threads by: Byprodriver and JFP in PA. They have shops and extensive rebuild information with accurate data. Also read up on LN Engineering.
The early 986 cars up to 2000 had issues with failure that got worse when Porsche went to a single row bearing in the changeover from around 2001 to 2004. The 05 997 and 987’s to the 08’s had the ‘non-serviceable’ IMS, meaning the only way to replace it is to disassemble the engine.
Having said that the 06-08 cars can be perfectly reliable cars. My 06 Cayman has over 100k. These bearings are sealed and yes they can fail. They have a very low failure rate compared to the previous early IMS cars.
How do you plan to use the car? Daily, fun, track etc? These have different oil change frequencies and affect engine in different ways. Buy a car with a service history. Get a PPI. If you’re really concerned about ims failure, the best solution for you is to drop the trans, open the IMS door and have the seal removed. This way the bearing gets an oil bath. Change the oil frequently, like every 3-4K and at least once a year.
I change mine about every 2 K as I do some track days as well. Drive the car as it was meant to and enjoy yourself. Don’t skimp on maintenance.
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