API Service Category CI-4 was introduced in 2002 for high-speed, four-stroke diesel engines designed to meet 2004 exhaust emission standards implemented in 2002.

API CI-4 oils are formulated to sustain engine durability where exhaust gas recirculation (EGR) and other exhaust emission components are used. API CI-4 oils are intended for use with diesel fuels ranging in sulfur content up to 0.5% wt. These oils provide optimal protection for control of corrosive wear tendencies, low and high temperature stability, soot handling properties, piston deposit control, valve train wear, oxidative thickening, foaming and viscosity loss due to shear.

Oils approved for API Service Category CI-4 are superior in performance to and can be used in place of API CD, CE, CF-4, CG-4 and CH-4 oils.

For more information on API CI-4, contact your Lubrizol representative.