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Most engines are bulletproof if you rebuild them every 100K miles, but not every engine suffers from broken head studs, failed con-rod bolts, excessive oil leaks, stripping threads in magnesium cases, premature wear in intermediate shaft bearing shells, early failure of camchain tensioners, exploding airboxes....I am sure I could go on but I guess you get the picture.
Truth as I see it is, as the cars are mostly owned by enthusiasts, and are regularly serviced and rebuilt as necessary they last forever! The 911 I own is the first Porsche I have had and I was surprised how much can go wrong with these engines compared to a lot of other makes.
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