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I asked the expert about the failure rate of the '06-'08 engines and their Rev 3 IMS design and he said there were very few replacement shafts sold compared to the bearing replacement kits for the '97-05 Rev 1 and 2 designs. Part of that is so many of the cars were still under warranty and so Porsche was replacing the engines. But part of it may be a more successful design. How much of the latter we'll only know as more of the cars are driven longer without warranty and so people are forced to seek solutions outside the dealer network.
All parts that rub together eventually fail. Yes changing the oil frequently, using a good oil, and driving the car properly can statistically lessen the probability say the experts.
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