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As well as a four-wheeled vehicle, in the field of motorcycle, development of the CO₂ reduction technology and practical use are required for global environment protection. Therefore the energy conserving by engine oil is required. There are several technologies which have been applied to the passenger car engine oils using lower viscosity base oils and some friction modifier additives. However, these technologies might bring difficulties or problems to apply to the motorcycle engine oils. Since motorcycles normally have transmission gears and a wet clutch system inside the crankcase, the gear lubricity and clutch friction performance are additionally required for motorcycle engine oils. Motorcycle engine oils are also used under severer conditions than passenger car engine oils. Therefore, lower volatility performance at higher temperature conditions, higher shear stability, anti-wear performance and gear pitting toughness are needed.