Mitsubishi 4G69 engines produced from June 2007 and later have been built according to a new design that eliminates the oil accumulator and its mounting hole.

Replacement cylinder heads follow this new design. When installing a new-style cylinder head on an engine that originally featured an oil accumulator, the accumulator is not required.

Applicable vehicles include 2003-2006 Outlander, 2004-2006 Lancer and Lancer Sportback, 2004-2007 Galant, 2006-2008 Eclipse and 2007-2008 Eclipse Spyder.

The oil accumulator in the cylinder head is no longer used in replacement heads for the 4G69 engine.