What type of engine oil should be used for Yunnei engines?
2 Answers
10w-40 engine oil. Taking the Yunnei D25 engine as an example. Below is relevant information about this engine: 1. Power performance: National IV phase: Maximum horsepower 143Ps, maximum torque 360N.m. National V phase: Maximum horsepower 143Ps, maximum torque 400N.m. National VI phase: Maximum horsepower 163Ps, maximum torque 400N.m. 2. Applicable vehicle models: This engine has been widely used in various brands of light trucks during the National IV phase, including specific models such as JAC Junling, Sinotruk HOWO light trucks, Dayun Aopuli, etc.
Choosing the right engine oil for Yunnei engines requires careful attention. Generally, for heavy-duty diesel engines like Yunnei, a 15W-40 viscosity oil is recommended, with an API standard of CI-4 or higher, such as CK-4. In my experience working at repair shops, I've handled many of these models—oil selection should consider the engine type and year. Newer models may require synthetic oil, while older ones can use mineral oil. Climate is also crucial: in hot summer regions, a thicker 40-viscosity oil helps prevent overheating and wear, whereas in cold winter areas, a thinner 5W-30 oil avoids startup difficulties. Don’t skimp on quality—low-grade oils oxidize and foam easily, leading to increased engine noise or higher fuel consumption. Regularly check the dipstick to ensure proper oil levels, and change the oil every 8,000 to 10,000 kilometers to keep the engine clean. If you don’t have the user manual, consult an authorized service center for precise advice to avoid unnecessary repair costs.
