If he's a "big time drag racer" what's he doing with a minimum wage counter job? Two of my cars came with 5W30 synthetic from the factory, as have millions of others out there. Get the proper weight as shown in your owner's manual. If this is for a non-factory built Chevy engine, I would be comfortable with a premium 10W30 in there. If its over 450hp, I'd move up to a 15W40.
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