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Conventionally, the engine oils for passenger cars have been used as four stroke cycle gasoline engine oils for motorcycle from old-time. However, the engine oils for passenger cars have been required to have fuel economy performance, and these engine oils are not fit in the requirement of motorcycles because of low friction and low viscosity. For this reason the four stroke cycle gasoline engine oils for motorcycles have been classified into two categories of ‘MA’ and ‘MB’ based on differences in friction characteristics according to standard of Japan Automobile Standards Organization (hereinafter referred to as ‘JASO’) -JASO T 903:1998. In currently, some engine oils for passenger cars can fit in JASO standard, but the range of friction coefficient in MA category is becoming wider.