API CI-4 Plus

API CI-4 oils that also carry the classification CI-4 PLUS are formulated to provide a higher level of protection against soot-related viscosity increase and viscosity loss due to shear in vehicles powered by diesel engines. As of September 1, 2004, oils that meet the...

API CG-4

API CG-4 was introduced in 1995 for severe duty, high-speed, four-stroke diesel engines used in both on-highway (0.05% wt sulfur fuel) and off-highway (less than 0.5% wt sulfur fuel) applications. API CG-4 oils are required for engines meeting 1994 emission standards....

API CD

API CD was first introduced in 1955 for certain indirect-injection, naturally-aspirated, turbocharged or supercharged diesel engines running on fuels with a wide quality range (including high-sulfur fuels). Oils designed for this service have requirements for...

API CF-4

API CF-4 was introduced in 1990 for high-speed, four-stroke, naturally aspirated and turbocharged diesel engines. Oils approved for API CF-4 were designed to be used in place of API CD and CE oils, providing improved control of oil consumption and piston deposits. API...

API CH-4

API CH-4 was introduced in 1998 for high-speed, four-stroke diesel engines without advanced after-treatment emissions systems, designed to meet 1998 exhaust emission standards. API CH-4 oils are specifically designed for use with diesel fuels with a sulfur content of...

API CJ-4

API Service Category CJ-4 is the primary performance category for high-speed, four-stroke diesel engines designed to meet 2010 model year on-highway and Tier 4 non-road exhaust emission standards, as well as for previous model year diesel engines. These oils are...