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    Difference between automotive engine oil and Small Engine Oil?

    Is there any difference between 5W30 standard automotive engine oils and 5W30 4-cycle small engine oils?
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    API oil service classifications...

    Hi all, new member here! Can someone tell me exactly what the API oil service classifications mean? I went to this site: http://api-ep.api.org/filelibrary/A...lGuide_2004.pdf But all it really says about the Service Classifications is what years (and prior) of engines they are suitable...
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