Is 0W40 Engine Oil Suitable for All Seasons?

[PaisleyFitz]

0W40 engine oil is suitable for all seasons, but the selection should be based on the temperature of the region where the vehicle is located. When choosing engine oil, car owners can consider the local temperature, vehicle characteristics, and condition. Using oil with excessive viscosity can increase movement resistance and affect engine power. Engine oil, also known as motor lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. Engine oil consists of base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil, providing certain new characteristics, making them an essential part of the lubricant.

[McWyatt]

I've been using 0W40 oil for three years, and it starts right up even at -30°C in Northeast China. During summer highway drives, I've gone eight hours straight without any oil temperature warnings. However, I must remind you that oil viscosity grades aren't everything. Take my buddy's old German turbocharged car for example - the manual clearly requires 0W40 with A3/B4 certification. He cheaped out and used a no-name brand, and sludge formed after just one winter. When choosing oil, don't just look at the viscosity grade; consider OEM certifications and base oil quality too.

[CassidyLee]

Having run an auto repair shop in Xinjiang for over a decade, I've handled at least hundreds of barrels of 0W40 oil. While this viscosity works for both winter and summer, the specific formulation matters. Premium oil forms quick protective films in winter and maintains film strength during high-speed summer driving. Last time, a worksite Prado using cheap 0W40 showed performance degradation after just 7,000 km. For true all-season oil, prioritize Mobil, Shell, or Castrol - their base oils offer superior stability.

[MadelynAnn]

My family uses 0W40 oil for both cars all year round. The old Toyota V6 engine manual recommends 5W30, but the mechanic said thicker oil is better for high mileage. This oil can still flow at -35°C and provides adequate high-temperature protection at 40°C. Just remember not to exceed a 10,000-kilometer oil change interval. Last year, my friend forgot to change the oil, and sludge clogged the VVT valve.