Quote:
Originally Posted by tamarsha
It doesn't look like Royal Purple is on Porsche's approved oil list. But they also frown on my BNC air filter, FVD software, techno torque plenum, 200 cell cats and even my Sirius receiver.
Porsche-Approved Oils
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Does anyone know if there are there any oil companies on the Porsche approved list that pay no money to Porsche but are still included?
In other words, does anyone know how an oil becomes "approved"?
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