Can Different Types of Motor Oil Be Mixed?

[DeAngelina]

Different types of motor oil should not be mixed. Since the compositions of motor oils vary, mixing them can lead to chemical reactions. It is essential to use the motor oil specified by the vehicle manufacturer; otherwise, it may affect the lifespan of the car engine. The hazards of mixing motor oils include: 1. Abnormal smoke from the exhaust pipe; 2. Accelerated accumulation of oil sludge; 3. Reduced sealing performance of piston rods or piston rings, leading to discoloration or damage; 4. Increased likelihood of engine malfunctions; 5. Severe wear of pistons and cylinder walls. The functions of motor oil are: 1. Lubrication: facilitating smooth movement between pistons and cylinders, and between main shafts and bearings to prevent part wear; 2. Assisting in cooling and temperature reduction; 3. Cleaning carbon deposits and sludge from engine components; 4. Sealing to prevent gas leaks and the entry of external contaminants; 5. Rust and corrosion prevention; 6. Shock absorption and cushioning; 7. Wear resistance.