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Originally Posted by RandallNeighbour
This may be a little off-topic, but you mechanical engineers out there will love answering it!
Not that I'd ever do it, but what would (or could possibly) happen to my Boxster's engine if I ran mineral-based oil in it versus the synthetic oil?
I've always wondered about this.
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Up until around 2000 Porsche did approve several conventional mineral oils for the Boxster. Then they were taken off the list as were some synthetics that had been approved.