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There are really two issues here. First, the probability it will occur. Second, the consequence if it does. The first is highly debatable. The second is not - cataclysmic failure.
The scenario here is very similar to the old air-cooled days, hydraulic tensioners were failing and destroying SC motors. Porsche introduced pressure fed tensioners which did address the issue. The first thing people (should) check when buying an SC is whether or not the tensioners have been upgraded to pressure fed. Ironically, the cost to have it done is pretty close to an IMS upgrade. No one wants to spend the money, but if you look at as an insurance policy, it really is a wise investment. My $.02.
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