Quote:
Originally Posted by CHICKS
"What will keep a diesel engine clean fails to do the job in a gasoline engine because the deposits are different, the fuel is different, the running conditions are different, and the oil's additive package is different."
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Rotella has a spark ignition certification too, "SM" in this case. Mobil 1 0w40 also has a compression and spark ignition certification for diesel and spark. It seems to be commonplace that an oil can meet the standards for both, if an oil lacks one or the other I would suspect they did not seek the certification or leave it off the label for marketing reasons.