Originally Posted By BradH
ZDDP #s don't tell the whole story; an oil can have high ZDDP levels and still not be a great oil.

True, other factors (detergents, etc.) also determine the quality of an oil. But ZDDP numbers are typically what people argue about. More ZDDP isn't always better. ZDDP concentrations over about 1800 ppm can actually do harm.

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