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American Petroleum Institute
Gasoline Engine Oil Service Classifications

Category

Status

Service

SN

Current

Introduced in October 2010 for 2011 and older vehicles, designed to provide improved high temperature deposit protection for pistons, more stringent sludge control, and seal compatibility. API SN with Resource
Conserving matches ILSAC GF-5 by combining API SN performance with improved fuel economy, turbocharger protection, emission control system compatibility, and protection of engines operating on ethanol-containing
fuels up to E85.

SM

Current

For 2010 and older automotive engines.

SL

Current

For 2004 and older automotive engines.

SJ

Current

For 2001 and older automotive engines.

SH

Obsolete

SG

Obsolete

SF

Obsolete

SE

Obsolete

CAUTION - Not suitable for use in gasoline-powered automobile engines built after 1979.

SD

Obsolete

CAUTION - Not suitable for use in gasoline-powered automobile engines built after 1971. Use in more modern engines may cause unsatisfactory performance or equipment harm.

SC

Obsolete

CAUTION - Not suitable for use in gasoline-powered automobile engines built after 1967. Use in more modern engines may cause unsatisfactory performance or equipment harm.

SB

Obsolete

CAUTION - Not suitable for use in gasoline-powered automobile engines built after 1951. Use in more modern engines may cause unsatisfactory performance or equipment harm.

SA

Obsolete

CAUTION - Not suitable for use in gasoline-powered automobile engines built after 1930. Use in more modern engines may cause unsatisfactory performance or equipment harm.