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Originally Posted by jsmithdmd
I use 15w-50. It comes in the large jugs for cheap. My mechanic (Been working on and racing Porsches since 1970) uses it and says that's what originally came in the Boxster.
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I don't think your mechanic is correct. And, 15W50 is very thick...not a Porsche approved viscosity. Maybe if you were racing in the desert.