Quote:
Originally Posted by bmussatti
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.
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Actually, you are both right. The 15W-50 was what Porsche recommended early on in the Box and it is still OK to use in hot weather situations.
However, the 0W-40 has been factory fill for some time and should handle most situations.
For everyday driving, the 15W-50 will use a bit more gas and create a bit more heat. If you live in cold climates, I would stay away from the 15W-50 as it will make starting your car a bit more work.