Quote:
Originally Posted by KRAM36
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Those stats are for failures tracked by Porsche through their engine replacement program.
They leave out the mountain of cars Porsche had no dealing with with post warranty where owners were entirely on their own. There are far too many variables left out to put any weight behind the percentages in the Porsche numbers beyond that single bearing cars fail far more often than dual row. Its pure guessing to attempt to decipher the technical cause based on the imprecise degree of separation. For instance a dual row bearing car may catch up to a single row bearing car in terms of probability of failure if given enough time or mileage without addressing the bearing. I can not think of a more difficult statistical probability to pin down due to the infinite number of underlying variables. Its like parachute jumping over Normandy in WWII.
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