CJ-4 and CK-4 are engine oil specifications, specifically used in diesel engines. However, they have different levels of performance and compatibility with different engine technologies.
First of all, CJ-4 is one of the API grades mainly used in heavy-duty diesel engines. It has a higher viscosity grade that provides good lubrication and protection properties at high temperatures and pressures. In addition, CJ-4 engine oil also has good antioxidant properties and cleaning properties, which can reduce the generation of carbon deposits and dirt. Therefore, CJ-4 is mainly suitable for engines that need to withstand high temperatures and high pressures, such as trucks, buses, ships and industrial equipment.
CJ-4: The CJ-4 is an older specification introduced in 2006. It is designed for use in diesel engines with exhaust after-treatment systems such as diesel particulate filters (DPF) and catalytic converters. CJ-4 oil provides greater protection against wear, deposits and oil oxidation than previous specifications. They are formulated to meet the higher requirements of modern diesel engines.
CK-4 is another API grade, mainly used for light vehicle diesel engines. In comparison, CK-4 has a lower viscosity grade and is suitable for engines with lower viscosity grades. Due to its lighter viscosity grade, CK-4 engine oil performs well in terms of fuel economy, reducing fuel consumption and increasing engine efficiency. Therefore, CK-4 is mainly suitable for engines that require cost-effectiveness, such as cars, SUVs and light trucks.
In addition, CK-4 engine oil has better low-temperature and high-shear properties, providing better protection when the engine is started. Due to its lighter viscosity grade, CK-4 engine oil is also suitable for newer emission standards such as Euro 6 and US Tier 3.
CK-4: CK-4 is an updated specification introduced in 2016. It is an improvement on the CJ-4 and is designed to provide better protection for diesel engines with exhaust aftertreatment systems. CK-4 oils have greater resistance to oxidation, wear and deposits, as well as greater shear stability. They are backwards compatible with older engines and can be used in engines requiring CJ-4 oil.
To sum up, CJ-4 and CK-4 are diesel engine oil specifications, among which CK-4 is a newer and more advanced specification. CK-4 oil provides better protection and performance than CJ-4 oil, making it suitable for use in modern diesel engines with exhaust aftertreatment systems. However, both specifications are suitable for most diesel engines, and it is important to follow the manufacturer’s recommendations for correct oil specifications to ensure proper engine performance and protection.