What is the oil grade for winter?
2 Answers
Winter oil grades are denoted by 'w', including 0w, 5w, 10w, 15w, 20w, and 25w. The functions of engine oil are: 1. To reduce friction between the cylinder liner, piston rings, and camshaft; 2. To form a seal between the piston rings and pistons, minimizing gas leakage and preventing external contaminants from entering; 3. To adhere to component surfaces, protecting them from contact with water, air, acidic substances, and harmful gases; 4. To alleviate the load on pistons, piston skirts, connecting rods, and crankshaft bearings; 5. To flush away carbon deposits, sludge, and worn metal particles from engine components through the flow of lubricating oil.
Back when I used to tinker with car repairs for fun, I did some research on winter engine oil. The key to oil grades lies in those numbers. For instance, in 5W-30, the 'W' stands for winter, and the first number '5' indicates low-temperature fluidity. In winter, the smaller this number, the better – ideally 0W-20 or 5W-30. This ensures smooth engine starts in subzero conditions without prolonged cranking. Using the wrong oil, like thicker 10W-40, can cause engine hesitation in cold weather and damage both the battery and engine. I remember last year when I switched to 0W-20 oil – my car started effortlessly on -10°C mornings in Beijing. Always check the grade label on oil bottles when inspecting your vehicle. Regular oil changes are a smart preventive measure to avoid roadside breakdowns. Consult your owner's manual religiously and use only the specified oil – this isn't an area to cut corners. Long-term use of correct oil extends engine life, reduces repair costs, and delivers real savings.
