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Zinc content in motor oils

The zinc content in Rotella (and other diesel oils) has been reduced, and will continue to be reduced, to meet EPA limits on zinc in motor oils. Rotella is due for another reduction for next year, I was told by Shell.

Oil additives with ZDDP (the zinc-containing compound whose concentration is being reduced) include Marvel Mystery Oil, STP, and Rislone--although I think some formulations of these products do not contain ZDDP; check the label.

You can learn more about ZDDP by doing a web search under "ZDDP." There was also a long discussion on this subject in the Yahoo 750-101 group recently.

Jeffrey Frey
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