What happens if I put 10W30 instead of 5W30?

When using 10W30 engine oil instead of 5W30, attention should be paid to their key differences. 10W30 has poorer low-temperature startup performance (its minimum applicable temperature is -25°C, compared to 5W30's -30°C), which may increase engine wear during cold starts. In regions with consistently hot climates where temperatures remain above 20°C year-round, short-term use of 10W30 typically won't cause significant issues, but prolonged use may accelerate carbon buildup. If temporarily substituting oils, reduce the oil change interval to under 5,000 km and revert to 5W30 as soon as possible. Special attention should be given to older, high-mileage engines exhibiting minor oil consumption, as using higher-viscosity oil may exacerbate seal deterioration.