Can Different Types of Engine Oil Be Mixed?

1 Answers
DeAlaina
07/29/25 5:56pm
Engine oils from different brands cannot be mixed. Engine oils from different brands and grades are formulated with various additives tailored to the working characteristics and environmental requirements of different engines, resulting in differences in viscosity, anti-wear properties, corrosion resistance, anti-knock performance, and volatility. Mixing them may degrade the oil's performance and even cause damage to the engine. Here are the reasons why engine oils should not be mixed: 1. Mixing new and used oil reduces performance. New and used oils should not be mixed. Used oil contains a large amount of oxidative substances, and when mixed with new oil, it accelerates the oxidation and degradation of the new oil, thereby reducing its effectiveness and lifespan. 2. Mixing oils can cause turbidity. Oils from different brands and grades should not be mixed. The chemical additives in different brands and grades of oil may react with each other, reducing lubrication effectiveness and producing acidic or alkaline compounds that accelerate corrosion of engine components.
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