What level of engine oil is less noisy?

The lower the viscosity of the oil, the less the noise. When the car is just started, the worse the fluidity of the engine oil, the louder the noise, so the smaller the viscosity of the engine oil, the lower the noise. After the car is warmed up and the temperature of the car rises, the fluidity of the engine oil will become better. , the noise will be relatively small at this time.

　　

Generally, the model of engine oil will have a letter W. The higher the number after W, the higher the viscosity of the engine oil, and the better the protection performance under high temperature. Theoretically speaking, the noise of 5W30 will be smaller than that of 5W40, but the noise of the engine is not only related to the oil label, but also related to the age of the car and the road conditions, and it cannot be used to reduce the noise of the car. Blindly choose engine oil with low viscosity, because adding inappropriate engine oil to the car will also increase the noise of the car, so what kind of engine oil label to add to the car is more suitable, mainly depends on the model recommended in the car instruction manual.