This paper primarily focuses on the development of the International Lubricant Standardization & Approval Committee(ILSAC)GF-5 passenger car engine oil category in North America and Japan including key technical performance requirements.New ILSAC GF-5 is scheduled to be introduced during the 3rd quarter of 2010 and will supersede ILSAC GF4 and previous categories.It will also be backward compatible and will provide improved performance relative to GF-4 in many respects.At the same time.when GF-5 is introduced.it is anticipated that API SN will also be introduced as a new performance category to supersede the current category,APISM.