HPM has been replaced by HPS. All HPM orders will be filled with HPS equivalent.
Royal Purple High Performance Marine Oil (HPM) is specifically formulated to maximize performance and provide superior protection for four-stroke marine engines. It exceeds the stringent NMMA FC-W Catalyst Compatible warranty requirements. HPM engine oils provide exceptional anti-wear protection with a load-carrying capacity multiple times that of ordinary mineral or synthetic marine lubricants. It delivers cooler operating temperatures, increases engine efficiency and maximizes horsepower and torque. Royal Purple’s advanced, proprietary Synerlec technology enables HPM to exceed the harsh demands of the marine applications.