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      04-01-2012, 09:24 AM   #24
FCBuff
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Drives: '11 335 Xdrive, Msport 6mt
Join Date: Jul 2011
Location: Ft Collins

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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.