Can Engine Oils of Different Brands Be Mixed?

1 Answers
MacMax
07/29/25 11:12am
Engine oils of different brands should not be mixed. The composition of oils varies, and mixing them can cause chemical reactions. It is recommended to use the oil specified by the car manufacturer, as failure to do so may affect the lifespan of the car engine. The functions of engine oil include: 1. Lubrication, ensuring smooth sliding between the piston and cylinder, and between the main shaft and bearing bush to prevent component wear; 2. Assisting in cooling and temperature reduction; 3. Cleaning carbon deposits and sludge from engine components; 4. Sealing to prevent gas leakage and the entry of external contaminants; 5. Rust and corrosion prevention; 6. Shock absorption and cushioning; 7. Anti-wear. The hazards of mixing engine 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 between the piston and cylinder liner.
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