Can Different Motor Oils Be Mixed?
2 Answers
Motor oils should not be mixed, and it is advisable to avoid mixing oils from different brands. This is because different formulations contain varying additives that may react with each other, leading to potential issues. Each brand's oil has distinct additive compositions, and chemical reactions can cause the oil to thicken or thin, partially losing its lubricating properties. More information about motor oil is as follows: 1. Motor oil is the lubricant for engine operation, providing lubrication, cleaning, cooling, sealing, and wear reduction for the engine. 2. It neutralizes acids produced from fuel combustion and lubricant oxidation, improves piston ring sealing, and plays a significant role in reducing engine component wear and extending service life.
After driving for so many years, I’ve found that mixing engine oils is really not recommended. Once, my oil warning light came on while I was on the highway, and I had to add a different brand of oil as an emergency measure. As a result, the engine noise increased, and fuel consumption went up. Later, when I took it to a repair shop for inspection, the mechanic said that mixing oils can cause additive conflicts—for example, reducing the effectiveness of anti-wear agents and detergents. Prolonged use can lead to increased impurities in the engine. Since then, I’ve only used the same brand and model of oil for regular changes, and I always check the oil level and color before each maintenance. Mixing oils might seem like a quick fix for shortages, but the long-term damage is hidden, like carbon buildup or seal aging, which can be expensive to repair. For safety, it’s best to keep a bottle of the same specification oil in the car to avoid emergency top-ups. Developing good habits extends the car’s lifespan and gives peace of mind.
