Which API classification indicates oil formulated for diesel engines meeting 2010 emissions standards?

The API classification designation CJ-4 indicates oils that are specifically formulated for use in diesel engines that meet the stringent emissions standards established in 2010. These oils are designed to provide effective lubrication while also helping to reduce emissions of particulate matter and nitrogen oxides (NOx), which are critical in addressing environmental concerns associated with diesel engines.

CJ-4 oils include advanced additive technology that enhances engine performance, prevents wear, and improves cleanliness, which is essential for maintaining the operational efficiency of modern diesel engines. This classification is particularly relevant for heavy-duty diesel applications and is made to work well with exhaust after-treatment systems like Diesel Particulate Filters (DPFs) that are necessary for compliance with EPA regulations.

The other classifications mentioned, such as GF, CC, and CI-4, do not reflect the same requirements as CJ-4. For example, GF refers to gasoline engine oils, CC is an older classification for certain diesel oils prior to stricter emissions standards, and CI-4 denotes oils that were developed before the CJ-4 standard and do not meet the 2010 emissions requirements.