Royal Purple Racing 21 motor oil works well in a variety of applications, from oval track late models to bracket racing. Racing 21 motor oil has a viscosity typical of 5W30 oil, and produces excellent horsepower while preventing wear. 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 racing oils provide more protection than conventional motor oils, mineral or synthetic, including those combined with aftermarket additives.
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