Mobil Pegasus? 805 Ultra is a high performance gas engine oil engineered to meet the rigorous demands of today’s high output four-cycle engines designed to reduce emissions and improve fuel-efficiency. It meets a wide range of OEM requirements making it a great choice where high-speed four-cycle engines from various OEMs are used. Mobil Pegasus 805 Ultra is designed to provide very good protection against piston scuffing, scoring and ring and liner wear. It also exhibits excellent resistance to foaming, good demulsibility and high-level corrosion protection. It is formulated with low levels of zinc and phosphorus making it compatible with engines equipped with catalytic converters.