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Royal Purple is what he uses. What he said was, if you want to void the warranty don't use RP. Take it to the dealer and use their GM brand. Have it ALL documented. He related a recent story of a gent who bought a new Chevy truck for his gardening business. He put on a flowmaster exhaust system, the engine blew and because of the exhaust system changeout the dealer wouldnt warranty the engine. Warranty appears to be a very straight forward thing in these financially strapped times for dealers and manufacturers.
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