API Engine Oil Classifications For Gasoline Engines "S"

API Automotive Gasoline Engine Service Categories	Previous API Engine Service Categories (other than “S”)	Automotive Model Years	Gasoline Engine Service Information (API licensing status)
SM*	None	2005	Meets 2005 emissions & fuel economy (GF-4). LATEST/CURRENT
SL	None	2001-2004	Lower volatility & improved fuel economy (GF-3) CURRENT
SJ	None	1997-2000	Improved fuel economy (GF-2). CURRENT
SH	None (CID-AA-52039B)**	1994-1996	Improved fuel economy (GF-1) introduction OBSOLETE (Valid mark if preceded by current C category)
SG	None	1989-1993	Improved overall protection over prior category. OBSOLETE
SF	None	1980-1989	Improved overall protection over prior category. OBSOLETE
SE	None	1972-1980	Improved protection for oil oxidation, deposits and corrosion. OBSOLETE
SD	MS (1968)	1968-1972	Improved protection over SC oils. OBSOLETE
SC	MS (1964)	1964-1968	Beginnings of modern engine oil technology (dispersant/detergent/antiwear). OBSOLETE
SB	MM	(1930’s and 40’s engines)	Oils provide only mild anti-scuff capability and resistance to oxidation and bearing corrosion. OBSOLETE
SA	ML	(1900 to 1940 engines)	Straight mineral oil. Engines operated under such mild conditions that the protection afforded by compounded oils is not required. OBSOLETE