Will Using 40-Grade Engine Oil Damage the X-Trail?

[ValentinaLynn]

Using 40-grade engine oil in the X-Trail will not damage the car, but it may slightly increase fuel consumption. Functions of Engine Oil: To reduce friction and high-temperature effects, a sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby minimizing wear. It also serves as a sealant, forming a sealing ring between the piston rings and pistons to reduce gas leakage and prevent external contaminants from entering. Additionally, it provides anti-rust protection by adsorbing onto part surfaces to prevent contact with water, air, acidic substances, and harmful gases. Uses of Engine Oil: As a lubricant, it reduces friction and damage between moving parts. For example, it minimizes friction between the cylinder liner and piston rings (or camshaft).