Does Using 10w40 Engine Oil Affect New Cars?

[StEsther]

As long as it meets the viscosity specified by the original oil, 10w40 engine oil can be used for new cars. Meaning of engine oil specifications: Taking 15W-40 and 5W-40 as examples: W stands for winter. The smaller the number before W, the better the low-temperature fluidity of the oil, indicating it can be used in lower environmental temperatures and provides better engine protection during cold starts. 5W represents resistance to external low temperatures of -30°C, while 20W is resistant to -15°C. The number after W represents the kinematic viscosity of the oil at 100°C, with higher values indicating higher viscosity. Difference between mineral oil and synthetic oil: Synthetic oil has a wider temperature range, longer service life, and higher cost. For the same oil film requirements, synthetic oil can achieve the goal with lower viscosity, whereas mineral oil requires higher viscosity compared to synthetic oil to meet the same requirements. In the same working environment, synthetic oil indeed has a higher cost due to its significantly longer service life than mineral oil.