I blew two engines in my 2002 Boxster S before 32k km, both replaced by Porsche. It was tracked fairly regularly. So much for their claims it has an"integrated dry sump" !
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The oiling system used by Porsche is not a true dry sump; oil is held in a series of internal chambers within the engine, using a somewhat conventional oil pump, rather than inside of an external reservoir.
In terms of the practical application, the result is similar; the engine can be mounted lower due to reduced clearance requirements, and there is less oil on moving components within the engine, reducing power loss. Were your failures the result of oil starvation?