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Originally Posted by Tool Pants
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.
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Nothing bad would happen under normal cirumstances and over the initial miles of its use.
However, conventional oil would soon start to degrade and by say 5000 miles would not be doing a very good job of protecting your oil. It would be more than time to change the oil.
Of course, with syn, you can get many more miles per change.
