Classification of Automotive Diesel Engine Oil?
4 Answers
Diesel engine oil grades are broadly categorized into: CA, CB, CC, CD, CE, CF, CF-4, CG-4, CH-4, CI-4, CJ-4. Below is expanded information on diesel engine oil classifications: 1. Different grades of diesel engine oil indicate varying oil quality levels and corresponding suitable vehicle types. This means that the further the letter in the sequence, the higher the oil quality grade, and so on. The highest grade of diesel engine oil is: CJ-4. 2. Diesel engine oil grade specifications: The English letter 'C' at the beginning represents diesel engine oil. The further the letter in the sequence, the higher the oil quality grade. Generally, CD-grade oil is sufficient for diesel engines. 3. Turbocharged diesel engines require higher-quality oil, typically CF-4, where '-4' indicates that the oil is suitable for four-stroke diesel engines.
As a seasoned diesel vehicle driver with years of experience, I have a deep understanding of engine oil grades. Diesel engine oils typically have API grade markings like CF-4, CJ-4, as well as ACEA standards such as E9. The API rating indicates the oil's performance level—the higher the number, the newer the specification, making it suitable for modern engines to reduce wear and carbon buildup. Choosing the correct grade can extend engine life; for instance, my truck runs smoother after switching to CJ-4. Using the wrong grade may damage the engine or even clog the DPF system, leading to higher fuel consumption and costly repairs. Always consult your vehicle's manual for the recommended oil and change it every 8,000 km. Make it a habit to check oil bottle labels—don’t cheap out on no-name brands; safety comes first. Also, remember to use low-temperature viscosity oil in winter for better freeze resistance.
My diesel car requires frequent oil maintenance, and I always pay close attention to the API standards when selecting oil. Common API classifications include CI-4 and CK-4, with CK-4 being the latest mainstream option suitable for most diesel vehicles. ACEA grades like B4 or C3 are also important, reflecting the oil's adaptability to different emission systems. Higher-grade oils are purer and offer better protection. I regularly check oil labels to avoid mixing, as this can accelerate engine wear. Oil viscosity must also be considered—for example, 15W-40 is suitable for warmer regions, while 5W-30 performs better in colder climates. Consulting a mechanic is always a good idea; choosing oil shouldn’t be done hastily. Oil change intervals should be kept between 6,000-10,000 kilometers, which benefits overall vehicle maintenance.
In my work, I've encountered numerous failures caused by incorrect oil grades. API grades such as CJ-4 or CK-4 are designed for diesel vehicles, with differences lying in additives and cleaning properties. CK-4 protects the DPF system and reduces emission issues. Using oil with too low a grade can accelerate engine wear and even clog the fuel system. Oil selection must match the vehicle's year and manufacturer recommendations, with CK-4 being optimal for newer models. Regular oil changes to prevent sludge buildup are crucial, and inspecting the filter during each oil change can save significant repair costs.
