160 Degree Thermostat | Sierra 18-3558 Thermostat used on OMC and Volvo Penta 4 cylinder fresh water cooled marine engines. Fits OMC 2.5L and 3.0L closed cooled marine engines from 1982 to 1988 Fits Volvo Penta 3.0L closed cooled marine engines from 1994 to 2000 Replaces OMC 3853799 Replaces Volvo Penta 3853799