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Just want to know what sulfur does (detergent, anti wear, etc.) delo's syn blend says .34%, is this excessive or about average for an hde?
That is about the norm for most engine oils.
Sulfur is a natural anti-oxidant.
Sulfur is found mostly as a compound in ZDDP (Anti-Wear and anti-oxidant), MoDTC (Friction modifier), and in the detergents as in Calcium sulfate and Magnesium sulfate.