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Supposedly Mobil 1 15w50 still has significant levels of ZDDP (1200ppm vs 800 for the new standard) and 5w40 has even more (1300ppm). The motorcycle racing oil has the highest at 1600ppm but in my experience is very expensive at about $8/qt vs $6/qt for regular Mobil 1.
posted by 198.51.119...
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