Royal Purple Racing 51 motor oil is formulated to run for extended periods under extreme pressure and heat. Racing 51 motor oil is used in sprint cars, late models, marine applications, drag racing, and truck pulling, with a viscosity typical of 20W50 oil. Professional engine builders and race teams have cited increased horsepower and longer engine life with the use of Royal Purple. Utilizing their proprietary Synerlec additive technology, Royal Purple's racing oils provide more protection than conventional motor oils, mineral or synthetic, including those combined with aftermarket additives.
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