Can motor oils of the same brand be mixed?

[AsherAnn]

Motor oils of the same brand cannot be mixed. Although they share the same brand, different specifications of motor oils adhere to varying standards, viscosities, and low-temperature tolerances in winter, making them incompatible for mixing. Methods for selecting motor oil include: 1. The oil should appear clear with a sulfur content of less than 1%; 2. The weight of residual carbon content should be less than 1%; 3. The volume of water and sediment should be less than 0.1%; 4. The weight of ash content should be less than 0.03%. The functions of motor oil include: 1. Lubrication; 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 properties.