Royal Purple HMX High-Mileage Synthetic Motor Oil: Summit Racing

Purple Haze

Engine life can take a hit as the miles increase. Seals deteriorate, gaskets get brittle, piston rings wear, and valves don’t seal correctly. Engineered for gasoline engines with more than 75,000 miles, Royal Purple HMX High-Mileage Synthetic Motor Oil has Synerlec technology additives that bond with metal components to provide superior protection against corrosion, wear, and thermal breakdown—even during cold starts.

summit racing

Royal Purple HMX is packed with zinc and phosphorus, and conditions hardened or brittle seals to restore the pliability needed to seal tightly for fewer leaks, better oil breakdown, and less oil consumption. Additional features include:

• Exceptional oxidation stability
• Detergents remove deposits and extend engine life
• Safely extends oil drain intervals up to 15,000 miles or 12 months for unmodified, mechanically-sound engines with proper filtration
• Meets or exceeds API SJ, SL, SM, and SN specifications
• Available in 5W20, 5W30, or 10W30 weights


Summit Racing Equipment logo


Summit Racing Equipment






(800) 230-3030


P.O. Box 909

Akron, OH 44309

ABOUT Summit Racing Equipment®

Summit Racing Equipment was founded in 1968 as a part-time parts business in Stow, Ohio. Today, Summit Racing Equipment is one of the world’s largest supplier of automotive-performance-equipment company, and offers thousands of performance parts, aftermarket accessories, OEM parts, tools and garage equipment. Summit Racing’s goal is to give customers the parts they want at a fair price, deliver those parts fast, and back them with the best customer service on the planet.