One thought would be to get the engine shaft alignment checked to see if it was in tolerance. Doesn't Porsche have a tool to check this, and the reading then used to decide whether engine replacement is needed or not? (Course, if the same dealer dodged the engine bullet and just put in a seal, they wouldn't be likely to tell you, would they?)
For the others - isn't the alignment, or lack of, between the shaft and the outer boring the key to the seal's longevity?
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