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. 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 formulated for use in all applications with diesel fuels ranging in sulfur content up to 500 ppm (0.05% wt). However, the use of these oils with greater than 15 ppm (0.0015% wt) sulfur fuel may impact exhaust aftertreatment system durability and/or drain interval. When using API CJ-4 oils with higher than 15 ppm sulfur fuel, consult the engine manufacturer or service interval.
API CJ-4 oils are especially effective at sustaining emission control system durability where particulate filters and other advanced aftertreatment systems are used. Optimum protection is provided for control of catalyst poisoning, particulate filter blocking, engine wear, piston deposits, low- and high-shear stability, soot handling properties, oxidative thickening, foaming and A measure of a fluid's resistance to flow. A fluid with a higher viscosity flows less easily. loss due to shear.
The main physical and chemical requirements for API CJ-4 oils are shown below:
|High Temperature High Shear. A measure of a fluid’s resistance to flow under conditions resembling highly-loaded journal bearings in fired internal combustion engines, typically 1 million s–1 at 150°C. viscosity||American Society for Testing and Materials. An organization that develops international standards for industry, including test methods, specifications, and best practices. Many tests that certify a lubricant to a specification are overseen by ASTM. D4683||cP||≥ 3.5|
|A product of the combustion of metals commonly found in detergents. As a lubricant property, sulfated ash content is a measure of metal content (usually Zinc, Calcium, and Magnesium) and allows formulators to stay within specified limits in order to minimize the negative effects of abrasive ash particles. Sulfated ash is determined by charring the oil, treating the residue with sulfuric acid, and evaporating to dryness, the result being expressed as % by mass.||ASTM D874||%wt||≤ 1.0|
|Phosphorus||ASTM D4951||%wt||≥ 0.12|
|Sulphur||ASTM D4951||%wt||≤ 0.4|
Viscosity grades other than 10W-30
Oils approved for API Service Category CJ-4 exceed the performance criteria of Category CF-4, CG-4, CH-4, CI-4 and CI-4 PLUS, and can effectively lubricate engines calling for those API Service Categories.
For more information on API CJ-4, contact your Lubrizol representative.