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What are the classification grades for diesel engine oil?

2 Answers

BrynleeAnn

07/28/25 11:21pm

In the API quality classification system, the 'C' series denotes diesel engine oils. There are various grades of diesel engine oil, which can be broadly categorized as follows: CA, CB, CC, CD, CE, CF, CF-4, CG-4, CH-4, CI-4, CJ-4, and so on. Additional information about diesel engine oil is provided below: 1. The letters represent different meanings. The further the letter is in the alphabetical order, the higher the oil's quality grade. 2. Currently, CF-4 is the predominant diesel engine oil grade in China. CF-4 oil performs better than CF in terms of fuel consumption and piston deposit control, making it suitable for diesel engines using high-sulfur-content diesel, high-speed direct-injection diesel engines, and heavy-duty diesel engines.

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LauraFitz

08/12/25 3:44am

I've been driving diesel vehicles for decades and am quite familiar with engine oil grade classifications. The API standards are mainly divided into C-series grades, ranging from CD, CE up to the latest CK-4 and FA-4. The 'C' stands for diesel-specific, and higher numbers indicate better performance. For example, CK-4 is suitable for new engines, provides better emission control, and can extend engine life. Viscosity ratings like 15W-40 also matter - they ensure quick cold starts in winter. I always check the owner's manual when changing oil; using the wrong recommended grade can cause component wear, and oil change intervals should be adjusted according to the grade. Good quality oil can easily last 7,000-8,000 kilometers. These practices have saved me repair costs while ensuring safety and reliability. I recommend beginners directly purchase specified grade products from major brands.

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