High-grade API CJ-4/CK-4 Diesel Engine Oils High-grade API CJ-4/CK-4 Diesel Engine Oils are advanced lubricants specifically designed for use in modern diesel engines. These oils meet the latest industry specifications set by the American Petroleum Institute (API), including CJ-4 for older engines and CK-4 for newer engines. These high-grade Industrial Lubricating Oils offer superior protection and performance for diesel engines, helping to extend engine life, improve fuel economy, and reduce emissions. They are formulated with advanced additives and base oils to provide excellent wear protection, thermal stability, and oxidation resistance. In addition to meeting API specifications, high-grade CJ-4/CK-4 oils also meet or exceed the requirements of major engine manufacturers, ensuring compatibility and optimal performance in a wide range of diesel engines. They are suitable for use in both on-road and off-road applications, including heavy-duty trucks, construction equipmen…