Can 15w40 engine oil be used in winter?
1 Answers
15w40 engine oil can be used in winter in southern regions, but it is not suitable for areas in the north where winter temperatures drop below -20 degrees Celsius. The number before 'w' indicates the oil's low-temperature fluidity. The smaller the number, the better the low-temperature fluidity, and the lower the applicable minimum temperature. '15' means the oil is suitable for a minimum temperature of -20 degrees Celsius. The effects of not changing engine oil for a long time include: 1. The oil becomes ineffective and deteriorates, increasing wear and damage to engine components; 2. Reduced sealing effect, causing the oil to become watery and lose its sealing function; 3. Decreased cooling effect; 4. Accumulated impurities can corrode internal engine parts; 5. Loss of lubrication performance in bearings and lubrication and cooling functions in mechanical transmission components, affecting the vehicle's optimal driving condition; 6. Damage to the engine; 7. Formation of sludge leading to engine failure.