由日本石油联盟、日本汽车工业会、日本汽车技术会、日本陆用内燃机协会、日本润滑油协会和日本舟艇工业会共六个团体及其它相关企业(添加剂四个公司)组成的JASO发动机油标准普及促进协会宣布,从1999年7月份起,两轮摩托车用四冲程发动机油开始按照新制订的JASO T903标准进行分类。关于两轮车用四冲程油的性能分类在日本还属 JASO engine oil standard consisting of six groups including the Japan Petroleum Union, Japan Automobile Manufacturers Association, Japan Automobile Technology Association, Japan Land-based Internal Combustion Engine Association, Japan Lubricant Association and Japan Boat Industry Association and other related companies (four additives companies) The Association for Promoting Popularization announced that, starting from July 1999, two-wheeled motorcycles for four-stroke engines will begin to be classified according to the newly established JASO T903 standard. On the two-wheeled motor with four-stroke oil performance classification is still in Japan