Quote:
Originally Posted by maytag
To be honest, I don't know what to make of "no correlation to mileage", other than the frequency of failures must be so profoundly low as to be too small a sample to track trends.
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There are so many variations and no central authority tracking things. Porsche didn't for a long time want to know for legal reasons and fixes were, until recently, not Porsche developed or approved. Nor could they know all as replacement engines were frequently third party installations from wrecks.
First there are production variations. How do the crankshaft and IMS mounting holes line up in the block. Then the parts variations, thing like the trueness of idler pully bearings and such. Then the randomness of manufacturing tolerances in the bearings themselves. Now throw in weather conditions, driver techniques, oils used, oil change frequency, etc.
I've seen postings of 10k failures and 350k non failures. Two on the same car. Every transmission. Everything else clean. Everything in the engine trashed.