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My thoughts are some very clever automotive engineers with the help of vast resources have already worked this out for you and recommended an oil grade and replacement cycle based upon millions of miles of testing in all conditions and backed that decision up with an unlimited mileage 3 year warranty.
I'd go with that as anything else is just guess work and anecdotal, my own anecdotal evidence over 500,000 miles is they are worth trusting.
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730d/Z4C
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