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A high mileage oil may be OK, but you don't want to use either of the ones you've listed. The highest winter weight (the W figure) spec'd by Porsche is 5, not 10.
Regardless of what proper oil you use, lower miles between changes seems to influence engine health. It's est that 5-8K mi is the optimal interval between changes.
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PCA National HPDE Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5spd
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