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Posted by Gil in Spokane [67.185.42.254] on Thursday, February 17, 2011 at 00:50:15 :
In Reply to: Re: My gal of Pennzoil says 'meets SM and previous engine oil c posted by MoparNorm [71.110.251.13] on Wednesday, February 16, 2011 at 16:31:14 :
I agree. This is the same explanation I have heard ie most new engines have roller cams so the zinc additive is no longer needed and not being added in most oils.