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Originally Posted by thstone
With about 225,000 Boxsters/Cayman's sold, my guess is that the IMS failure rate is somewhere around ~2%.
This is based on about 2,000 L&N IMS replacements sold to date (all assumed to be out of warranty repairs) and probably an equal number of warranty engine replacements for IMS failure.
Of course, not all L&N IMS replacements were failures, some were preventative replacements while replacing the clutch, but I am making an assumption that for every preventiative IMS replacement there is someone who simply replaced their IMS failed engine with a stock donor engine without any IMS upgrade.
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Just my own back of the envelope estimates and assumtions. Would welcome to hear from anyone with some other ideas or numbers.
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Can really be supported because the assumptions are just that. No one but Porsche knows how many engine swaps and for what cause there have been. Enough so the IMS was redesigned twice and, if it was working perfectly, they wouldn't have. But to pluck some figure for engine replacements out of the air is to me a SWAG.
My own guess is the number that will fail over the car's lifetime is higher than your 2% but that is just because the car is so nice people try to extend the life of the car beyond what is normal. Another factor to consider is the treatment these cars now get as people buy them for less than $10k and may or may not maintain them as the original owner/aficionados did. That should increase the failure rate for whatever reasons they fail (and there are at least 21 known reasons that have been identified so far). Not to mention that so many are stored for long periods which is hard on lubricated parts.
But all cars fail...I'm going to take mine out for a spin in 15 minutes. I have my choice of 4 cars, it will get chosen.