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Old 06-13-2010, 10:56 AM   #7
jmatta
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Join Date: Nov 2007
Location: Chicago suburbs
Posts: 1,675
Just my opinion, but I wouldn't suggest running with 0W40 for a track day...too thin for proper lubrication and subject to heat shear. Have your mechanic fill with 5 or 10W40. One of the fellows that runs in our region cooked his engine by running M1 0W40.
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