Is it necessary to change the oil with higher viscosity for Chevrolet Explorer100000 km?

This mainly depends on the actual situation of your vehicle. There is no special power shortage when using 5w-30 engine oil. There is no need to change to 40 oil now. Under normal circumstances,120,000 to 300,000 kilometers can be replaced by 40 engine oil. The better the wear resistance, the better the protection of engine cylinder wall wear. It is most important to use oil with good fluidity to maintain the engine.