What are the types of diesel engine oil?

[IrisAnn]

Lubricating oil viscosity classification for all-season oil grades includes: 5W-20, 5W-30, 5W-40, 5W-50, 10W-20, 10W-30, 10W-40, etc. The following is an introduction to diesel engine oil: Diesel engine oil is the lubricating oil used in diesel engines. Diesel engine is the abbreviation for diesel-powered engine, which is characterized by high torque, high efficiency, and good economic performance. Its energy source comes from the combustion of diesel engine oil. Usage method: The maintenance of diesel engines using diesel engine oil is divided into three main parts. Carefully check whether the sealing gaskets of the air cleaner are installed incorrectly, wrongly, or missing, and ensure their tightness; maintain the lubricating oil filter to prevent the filter element from clogging, as negligence in this area can reduce the service life of the diesel engine; special attention should be paid to the fuel filter additive. Here, the fuel filter additive refers to the one in the fuel supply system. During routine maintenance, pay special attention to timely cleaning, promptly remove debris from various components, and ensure timely discharge.

[McCora]

I've driven diesel vehicles for many years, and common diesel engine oil models include the SAE viscosity series such as 15W-40, 10W-30, and 5W-40. The smaller the number before the W, the more suitable it is for cold weather, while a higher viscosity like 40 is better for high temperatures or heavy loads. API classifications are also crucial, with CJ-4 and CK-4 being the mainstream high-performance standards that protect the engine from wear and reduce pollutant emissions. Synthetic oils like 5W-40 are more durable but come at a higher price, whereas mineral oils like 15W-40 are more economical. Choosing the right model depends on the vehicle type and climate—for example, trucks in northern winters should use 10W-30 to avoid cold-start failures. I always check the owner's manual to ensure the model matches, as using the wrong oil can lead to faster engine carbon buildup and aging, doubling maintenance costs. During oil changes, regularly check the oil level, as diligent maintenance can extend the engine's lifespan.

[BraxtonLee]

As a buddy who frequently works on diesel engines, don't randomly choose diesel engine oil grades. Mainstream options include SAE 15W-40, which has moderate viscosity and wide applicability; API CJ-4 offers excellent high-temperature resistance, making it particularly suitable for long-distance driving. There's also 10W-30 for quick cold starts, and 5W-40 synthetic oil reduces friction but may cause leaks in older vehicles. The newer API CK-4 standard improves cleaning performance, reduces sulfur residue, and is more environmentally friendly. Always check the manual before selecting oil—matching it to your vehicle model is crucial. Using the wrong grade can clog fuel injectors and reduce engine power. Personally, I recommend changing oil every 8,000 kilometers and using oil test strips to check quality—it's cost-effective and ensures peace of mind.

[McHannah]

I only started researching engine oil grades after switching to a diesel vehicle recently. The SAE classification, such as 15W-40, is the most common and suitable for both winter and summer. 10W-30 and 5W-40 are designed for different temperatures, with the former ideal for northern regions and the latter offering stronger durability as a synthetic oil. API standards include CJ-4 and CK-4, where high-performance versions protect the engine better and low-ash formulations prevent emission issues. Always check the bottle label when selecting oil to avoid confusion, as using the wrong type can accelerate wear—I once experienced abnormal noises due to this. Premium brands often include synthetic formulas, but the key is to match the vehicle's design.

[VonEmmanuel]

Modern diesel engine oil specifications place greater emphasis on environmental protection. SAE 15W-40 and 5W-40 cover diverse scenarios, while API CK-4 offers better fuel efficiency and lower emissions compared to older CJ-4 standards, similar to how lightweight designs reduce fuel consumption. The newly introduced FA-4 standard optimizes viscosity and, when paired with synthetic technology, enhances mileage efficiency. Selection should consider region and usage—urban short trips favor high-compatibility grades, while long-haul heavy loads require wear-resistant types. Improper oil accelerates engine degradation, so certified products are recommended.