Which year was CJ-4 engine oil initiated for use?

CJ-4 engine oil was initiated for use in 2007. This designation is part of the API (American Petroleum Institute) classifications for diesel engine oils and corresponds to specifications that were developed to meet the needs of newer diesel engines, particularly those equipped with diesel particulate filters and after-treatment systems designed for emissions control. The introduction of CJ-4 was driven by the increasing need for oils that could provide superior performance while meeting stricter environmental regulations. This included enhancements in areas such as thermal stability, oxidation resistance, and wear protection.

By 2007, the industry had recognized the challenges posed by the transition to lower sulfur diesel fuels and the need to adapt engine oils accordingly to ensure longevity and performance. Therefore, 2007 marks an important milestone in the evolution of engine oils, aligning them with advancements in engine technology and environmental standards.