What Type of Engine Oil Should Be Used in Winter?
2 Answers
5W40 engine oil is suitable for external temperature ranges from -30°C to -40°C. The labeling and temperature resistance of engine oil are as follows: Engine Oil Labeling: The viscosity of lubricating oil is often indicated using SAE grades, such as SAE40, SAE50, or SAE15W-40, SAE5W-40. The 'W' stands for winter, and the smaller the number before it, the better the low-temperature fluidity of the oil. This indicates a lower environmental temperature at which the oil can be used and better protection for the engine during cold starts. Temperature Resistance of Engine Oil: 5W can withstand external low temperatures of -30°C, 10W can withstand -25°C, 15W can withstand -20°C, 20W can withstand -15°C, 30 can withstand external high temperatures of 30°C, 40 can withstand 40°C, and 50 can withstand 50°C.
The toughest part of winter driving is the cold engine start. I always switch to low-viscosity antifreeze oil. Living in the north where temperatures drop to -20 or -30 degrees Celsius, regular oil becomes super thick and can't pump, which is terrible for the engine. I specifically choose 5W-30 oil because the '5' at the beginning means it flows super fast at low temperatures, ensuring smooth starts and engine protection. Every November, I replace the old oil in advance and also check the battery and coolant to avoid surprises. Don’t forget to refer to the owner’s manual for the recommended type—don’t blindly use high-viscosity summer oil, or you’ll end up with higher fuel consumption and engine damage. In winter maintenance, save money but not on oil—safety first to keep your car running long. I’ve tried full synthetic oil; it’s a bit more expensive but durable, frost-resistant, and worry-free with regular oil changes.
