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      03-17-2020, 12:24 PM   #35
RagtagXMASTER
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Drives: 2013 M6
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Location: Boston MA

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I did forget to mention too that my oil change interval were very long, longer than what i should have let occur. the more i look at it the 30/40 are similar in viscosity, but may hold up better if changed earlier than 10/8k miles. I would think that the 9s are a little low, probably notice more power and better fuel economy too, but im guessing thats really hard to tell the difference.
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