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Originally Posted by cnavarro
I'm doing more oil testing in our track Boxster and plan on trying out Syntec 5w40 as well as 5w50 to see how it compares to previous oils, which have included Mobil 1 0w40, 10w40 4T Racing, Brad Penn 10w40, and Motul 8100 5w40. Next fill is Joe Gibbs Racing 10w40.
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Charles, isn't there a general rule that it is always best to have the two numbers closest together? For example a 5W40 vs. a 0W40 or a 15W50 vs. a 5W50. With the obvious understanding that the specific viscosity needs to meet the manufacturers requirements.