Can 15w40 engine oil be used in sedans?
2 Answers
15w40 engine oil can be used in sedans. The grade of engine oil is established to distinguish different operating conditions in various environments. As long as the viscosity performance and various indicators of the engine oil meet the standards set by the original vehicle, it can be used. Introduction to engine oil: 1. 15w40 engine oil is a multi-grade oil, where 15W represents the minimum operating temperature of the oil, which is -25°C for 15W oil; while 40 represents the maximum operating temperature of the oil. The higher the number, the greater the viscosity and the higher the applicable maximum temperature. 2. Excessive oil viscosity can increase engine operating resistance and wear.
Can 15W40 engine oil be used in a sedan? My opinion is, it depends on your car model and usage environment. My old car has been using 15W40 for over a decade, and it provides good protection in high temperatures, such as preventing engine overheating during highway driving in summer. However, I wouldn't recommend it for modern sedans. In winter, 15W40 is too thick, making cold starts difficult, increasing fuel consumption, and potentially causing faster engine wear. Checking your vehicle's manual is the most reliable approach—some older cars or vehicles in tropical regions may be suited for it. Regular oil changes are more important; don't save small money only to spend big on repairs. Overall, unless specified in the manual or in hot environments, don't risk using high-viscosity oil.
