Lubricant Oil or lubricant is a special liquid used to lubricate moving parts in machines and engines. It plays an extremely important role in reducing friction, wear, heat dissipation and protecting internal machine parts from damage.
Diesel engine is a type of internal combustion engine that operates on the principle of compressing air to high temperatures to automatically ignite fuel. Unlike gasoline engines that use spark plugs for ignition, diesel engines utilize the heat energy generated from the compression process to activate the combustion process.
When choosing Choosing engine oil for diesel engines, many people often wonder whether CK or CJ grade oil is the best choice. To answer this question, we need to understand API standards (American Petroleum Institute) and the properties of diesel engine oils.
API classifies lubricants into two main groups:
The second letter in the API designation indicates the quality of the oil, in order from lowest to highest. For example, grade CJ is higher than grade CI, and grade CK is the newest available.
| Grant | Description |
| CA | For use in diesel engines manufactured before 1959. |
| CB | For use in diesel engines manufactured before 1961. |
| CC | For use in diesel engines manufactured before 1990. |
| CD | For some turbo diesel engines |
| CJ-4 | Meets emission standards from 2014, suitable for many types of diesel fuel |
| CK-4 | The highest level available, designed to protect engines under heavy load and high speed conditions |
Diesel engines typically operate at lower rpm than gasoline engines (around 1000 – 2000 rpm), but generate more sludge and carbon. Therefore, diesel engine oil needs to be able to:
Below is a comparison table between two types of engine oil CK and CJ:
| Criteria | CJ-4 Engine Oil | CK-4 lubricant |
| Release year | 2014 | 2017 |
| Protection ability | Better than CJ-4 | Superior to CJ-4 in resistance to oxidation and viscosity loss |
| Emission standards | Meet emission standards since 2014 | Designed to meet stricter emissions standards from 2017 |
| Additives | Contains many anti-scale additives | Contains advanced additives to help protect exhaust gas treatment systems |
CK-4 represents a significant improvement over CJ-4, with 25% better oxidation resistance and 12% increased wear protection. Source: Society of Automotive Engineers (SAE) “Technical Report on Diesel Engine Oil Standards” (2022) USA.
CK-4 lubricant not only provides good lubrication but also helps:
The choice between CK and CJ oils depends on the specific requirements of each type of diesel engine. However, with improvements in technology and increasingly stringent emission standards, CK-4 oils are considered the best choice for modern diesel engines.
Global market analysis shows that CK-4 grade lubricants now account for 65% of total heavy-duty diesel engine oil sales, with an annual growth rate of 15%. Source: McKinsey & Company “Global Automotive Lubricants Market Analysis” (2024) USA.
If you are unsure about which type of engine oil is suitable for your vehicle, seek out experts like Thanh Phong Auto for accurate and dedicated advice.
Using CK engine oil helps reduce friction and wear, thereby extending engine life by up to 30% compared to using lower grade oils such as CJ.
Factors include:
You can see more Harmful effects of poor quality lubricants & the best choice is shared in the most detail.
The price of CK oils is usually about 10-20% higher than CJ, but this cost is offset by better performance and protection.
For modern diesel engines, CK-4 oil is recommended, while older engines may use CJ-4 or lower depending on the specific condition.
The ideal oil change interval is between 5.000 and 10.000 km, depending on the type of oil used and operating conditions. For synthetic oils, it can be extended up to 15.000 km.
Some notable brands include:
These brands all provide products that meet high API standards, ensuring the best performance for diesel engines. Check out the products now Castrol GTX 15W-40 engine oil Genuine, best price.
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