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Originally Posted by Chinook View Post
While I like the increased ZDDP of the M1 oils, I haven't heard anything about the deleterious effects on the CatConv. Anybody killing their cats or O2 sensors.

Great stuff and thanks,

Gary Siemion
That is most likely due to the use of a different grade of zddp which keeps most of the phosphorous in the oil. Which grade? That is a question for the M1 mfr.
Old 06-21-2013, 05:34 PM
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