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With Mobil 1 last time I checked the Porsche oil is 0W-40 European Formula. "Formula M" in contrast describes oil meant for Mercedes diesels.
In any event, the oil should include "Meets Porsche A40" printed on the container.
In addition, there is zero advantage to 10W-40 versus 0W-40 in any conditions.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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