What kind of engine oil should be used for NK250?

[Emman]

10w40 engine oil is better. The main functions of engine oil are as follows: Lubrication and friction reduction: There is rapid relative sliding between the piston and cylinder, as well as between the main shaft and bearing shells. To prevent excessive wear of components, an oil film needs to be established between the two sliding surfaces. A sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby achieving the purpose of reducing wear. Cooling and temperature reduction: Engine oil can bring heat back to the oil tank and then dissipate it into the air to help the radiator cool the engine. Good engine oil can carry carbon deposits, sludge, and worn metal particles from engine components back to the oil tank through circulation, and flush away dirt generated on the working surfaces of components through the flow of the lubricating oil.