The factory fill Mobil 1 0W40 the Porsche and GTR guys swear buy has a much better additive package than the Mobil 1 5w30 or any of the other energy conservation oils.
Redline, Motul, and Amsoil are all better oils than the Mobil 1 5w30 as well but I haven’t seen anything that shows they are better than the Mobil 1 0w40. Plus those cost twice as much or more while Mobil 1 0w40 can typically be found at AutoZone and Wal-mart for under $5 a quart.
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