The MotoSport.com FilGuard Honda HP4S Full Synthetic Oil Change Kit includes TWO quarts of Pro Honda HP4S 4-Stroke Full Synthetic Oil and ONE FilGuard Premium Oil Filter, with the option to choose ONE quart of Pro Honda HP Transmission Oil, each with the following features: Pro Honda HP4S 4-Stroke Full Synthetic Oil: New Pro Honda HP4S is Honda's first fully synthetic 4-stroke motorcycle oil and was quite literally years in the making. HP4S is compatible with synthetic blends such as HP4, as well as regular petroleum oils like GN4. There is no need to flush the crankcases before switching to HP4S. Offers lower friction than conventional oils and better oxidation resistance for better high heat performance. Also gives higher film strength and quicker flow to vital engine parts at low temperatures, especially during start up. Provides maximum power due to less frictional drag.