Can the same model of engine oil be mixed?
2 Answers
The same model of engine oil cannot be mixed, as the additives may differ and could react with each other, causing various issues. Composition of automotive engine oil: Engine oil consists of two parts: base oil and additives. The base oil is the main component of lubricating oil, determining its basic properties. Additives compensate for and improve the shortcomings of the base oil's performance, endowing it with certain new characteristics, making them an important part of lubricating oil. Importance of automotive engine oil: The condition of the engine oil not only directly affects the working state of the engine but also influences its lifespan. The working environment of engine oil is extremely harsh, with impurities from gasoline combustion contaminating the oil, leading to oxidation and deterioration over time.
As a car enthusiast who has driven for many years, I've concluded that while motor oils of the same specification, such as 5W-30, can theoretically be mixed, I recommend doing so only in emergencies. Why be so cautious? Even with the same specification, different brands' formulations may lead to additive conflicts, potentially causing increased engine noise or reduced lubrication effectiveness. Once during a trip, I mixed a bit of different brand oil in an emergency, and the engine performance deteriorated—it only recovered after a complete oil change. In the long run, motor oil acts as the engine's protective layer, and mixing different brands may accelerate wear or shorten the oil change interval. It's best to stick with the same brand of oil for routine maintenance to avoid headaches. Regularly checking the oil condition can also prevent issues—don't overlook potential risks for the sake of convenience. This is a lesson I've learned from multiple car repair experiences.
