American Petroleum Institute. The primary oil and natural gas trade association in the United States. API operates a voluntary licensing and certification program that allows engine oil marketers to use the API Engine Oil Quality Marks if their products meet specific requirements. CH-4 was introduced in 1998 for high-speed, four-stroke diesel engines without advanced after-treatment Mobile sources - Pollutant exhaust gases created by the combustion of fuel. Water and CO2 are not included in this category, but CO, NOx, and hydrocarbons are and are thus subject to legislative control. All three are emitted by gasoline engines, while diesel engines also emit particulates that are regulated. Stationary sources - The release of sulfur oxides and particulates from power stations that can be influenced by fuel composition. Local authorities control the sulfur content of heavy fuel oils used in such applications. 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 up to 0.5% wt.
Oils approved for API Service Category CH-4 are superior in performance to, and can be used in place of, API CD, CE, CF-4 and CG-4 oils.
For more information on API CH-4, contact your Lubrizol representative.