American Petroleum Institute (API) - diesel engine

“C”- COMMERCIAL CLASSIFICATIONS FOR DIESEL ENGINES

CF-For 1994 Off-Road Indirect Injected Diesel Engine Service

API Service Category CF denotes service typical of off-road, indirect injected diesel engines and other diesel engines that use a broad range of fuel types, including those using fuel with higher sulfur content (over 0.5% wt sulfur fuel). Effective control of piston deposits, wear and corrosion of copper-containing bearings is essential for these engines, which may be naturally aspirated, turbocharged or supercharged. Oils designated for this service may also be used when API Service Category CD or CE is recommended. CF is a current specification.

CF-2- FOR 1994 Severe Duty 2-Stroke Cycle Diesel Engine Service

API Service Category CF-2 denotes service typical of two-stroke cycle engines (such as Detroit Diesel) requiring highly effective control over cylinder and ring-face scuffing and deposits. Oils designated for this service have been in existence since 1994 and may also be used when API Service Category CD-II is recommended. These oils do not necessarily meet the requirements of CF or CF-4, unless they pass the test and performance requirements for these categories. CF-2 is a current specification.

CF-4- For 1990 Diesel Engine Service

Service typical of severe duty turbocharged, 4-stroke cycle diesel engines, particularly late models designed to give lower emissions. These engines are usually found in on-highway, heavy-duty truck applications. API CF-4 oils exceed the requirement of CE category oils and can be used in place of earlier CC, CD and CE oils. CF-4 oils provide for improved control of piston deposits and oil consumption.

The CF-4 classification meets Caterpillar’s 1k engine requirements, as well as earlier Mack Trucks (T-6 & T-7) and Cummins (NTC-400) multi-cylinder engine test criteria. When combined with the appropriate “S” category, they can be used in gasoline and diesel powered cars and light trucks as specified by the vehicle and/or engine manufacturer.

CG-4- For 1995 Severe Duty Diesel Engine Service

API Service Category CG-4 describes oils for use in high speed, four-stroke cycle diesel engines used in highway and off-road applications, where the fuel sulfur content may vary from less than 0.05% by weight to less than 0.5% by weight. CG-4 oils provide effective control over high temperature piston deposits, wear, corrosion, foaming, oxidation stability and soot accumulation. These oils are especially effective in engines designed to meet 1994 exhaust emissions standards and may also be used in engines requiring API Service Categories CD, CE and CF-4. Oils designated for this service have been in existence since 1995. CG-4 is a current specification

CH-4- For 1999 Severe Duty Diesel Engine Service

API Service Category CH-4 describes oils for use in high speed, four-stroke cycle diesel engines used in highway and off-road applications. CH-4 oils provide effective control over engine deposits, wear, corrosion, oxidation stability and soot accumulation. These oils are especially effective in engines designed to meet 1999 emission standards and may also be used in engines requiring API Service Category CG-4. Oils designated for this service have been in existence since 1999. CH-4 oils are engineered for use with diesel fuels ranging in sulfur content up to 0.5% weight. CH-4 is a current specification.

CL-4- For 2002 Severe Duty Diesel Engine Service

API Service Category CL-4 describes oils for use in those high speed, four-stroke cycle diesel engines designed to meet 2004 exhaust emissions standards and was implemented in October 2002. These oils are engineered for all applications where diesel fuel sulfur content is up to 0.05% by weight. These oils are very effective at sustaining engine durability where EGR ( Exhaust Gas Recirculation) and other exhaust emissions systems are used and provide for optimum protection in the areas of corrosive wear, low and high temperature stability, soot handling properties, piston deposit control, valvetrain wear, oxidative thickening and foaming and viscosity loss due to shear. API CL-4 oils are superior in performance to those meeting API-CH-4, CG-4 and CF-4 and can be used and will effectively lubricate diesel engines specifying those API service Classifications