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      10-23-2012, 05:09 PM   #25
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Originally Posted by FCBuff View Post
Both are good oils. M1 0w-40 meets all current specs, GC does not...if that matters to you. I believe M1 is better oil, but have used GC for years with never a problem.
Dug this thread up in a google search.
Which specs does GC not meet?
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