What are the grades of diesel engine oil for vehicles?
2 Answers
The grades of diesel engine oil for vehicles are: ca, cb, cc, cd, ce, cf, cf4, cg4, ch4, ci4, and cj4. The functions of engine oil are: 1. To alleviate friction and high temperatures; 2. To reduce gas leakage and prevent external pollutants; 3. To prevent contact between water, air, acidic harmful gases, and parts; 4. To buffer the pressure rise at the engine cylinder port; 5. To flush away dirt generated on the working surfaces of parts. The characteristics indicating the need for oil change are: 1. Check the viscosity of the oil; if there is no viscosity, the oil needs to be changed; 2. The color of the oil is black; 3. There are excessive black particles, metal shavings, or carbon deposits in the oil; 4. The smell of the oil is abnormal.
Since I started driving, I've noticed there are quite a few grades of diesel engine oil for vehicles. The API classification like CK-4 is the most commonly used, suitable for protecting modern diesel engines, while older standards like CJ-4 or even older CD are rarely seen now. In Europe, they use ACEA E6 or E9 grades, which have higher environmental requirements. When choosing oil, it's essential to match the vehicle's manual; otherwise, using the wrong oil can cause faster engine wear or clog the DPF system. I recently switched to CK-4 grade oil myself, and I feel the engine noise has reduced significantly, plus it's more fuel-efficient. Regularly checking oil quality and viscosity, such as 10W-40, is also crucial—don't skimp by buying off-brand products; it saves money and ensures safety in the long run. Experience tells me that neglecting oil grades can easily lead to skyrocketing repair costs, especially when driving in the city with frequent starts and stops.
