Royal Purple Racing 41 motor oil is designed for marine, sprint car, late model, and endurance car racing. Capable of withstanding long intervals of extreme heat, it works especially well with alcohol and methanol, and has a viscosity typical of 10W40 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 racing oils provide more protection than conventional motor oils, mineral or synthetic, including those combined with aftermarket additives.
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