Can you explain the difference between API service categories CD, CD II, CE, CF, CF-2, CF-4, CG-4 and CH-4?
The American Petroleum Institute (API) has developed a two-letter code to describe quality levels in both gasoline and diesel engine oils. These codes are used by the engine manufacturers in their owner’s manuals to identify the appropriate quality of oil to use in their specific engines. The codes can typically be found on the bottle labels for quarts or gallons of engine oil. The C codes are for compression-fired diesel engines. The S codes are for spark-ignited gasoline engines. Oil quality levels are developed through broad industry agreement involving the oil suppliers and the engine manufacturers. Over the past decade, changes in diesel engine oil quality levels have been primarily driven by restrictions on diesel engine emissions. The Environmental Protection Agency (EPA) upgraded Clean Air Act (CAA) regulations in 1988, 1991 and 1994. Oil quality (and engine technology) changed in response to these regulations. The most recent implementation date for CAA regulations was in 1998
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