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Once your engine is fully warmed up (180+) you're both running 40 weight oil so unless Hi-mileage is not full synthetic there is no horsepower difference & your neighbor is not a oil expert either. Search this forum for oil info.
Whats the best bar in Pismo Beach?
Last edited by BYprodriver; 05-16-2012 at 09:33 AM.
Reason: curious
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