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The target engine for HKS Super Oil HR series is the most-advanced NA engines. Friction reduction can be experienced under various driving stages from daily driving to circuit driving. Oil viscosity resistance is reduced while maintaining the oil film to run the engine without any stress.
HKS Super Oil HR series is a replacement of "Premium Pro OIL" and "RACING Pro OIL." -4W31 is equivalent to API standard 0W30. Low viscosity at the regular use range from 40℃ to 100℃ can improve the engine response. Also, the engine condition at the high load range is highly maintained. 0W42 is multi-grade type. This type is recommended not only for NA engines but also GT Supercharger installed vehicles.