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Royal Purple® HMX® is specifically formulated with robust zinc and phosphorous anti-wear additives and Royal Purple's proprietary Synerlec® additive technology to minimize wear and restore lost engine performance. HMX is chemically enhanced to revitalize hardened seals reducing oil consumption common in higher mileage engines. Heavy duty detergents remove engine deposits and maintain cleanliness promoting engine longevity. Royal Purple's advanced Synerlec technology provides exceptional film strength by reducing friction for maximum engine performance. Synerlec also provides excellent oxidation resistance to safely extend oil drains, and an ionic attraction to the metallic components that maintain an oil film on the parts, minimizing starting wear.