Can Different Brands of Engine Oil Be Used Together?
2 Answers
Automotive engine oils can be mixed, but it is not recommended. Although all engine oils are composed of base oils and additives, the composition of base oils and additives varies for each type of oil, leading to differences in performance. Potential adverse effects of mixing include: 1. Causing the oil to become cloudy and degrade in quality. 2. Reducing lubrication performance and cooling efficiency. 3. Affecting the oil's lifespan. The specific steps for changing engine oil are as follows: 1. Use a jack to lift the vehicle, locate the drain plug, and unscrew it to drain the oil. 2. Remove the oil filter and place a container beneath it. 3. Replace with a new oil filter and add new oil.
To be honest, after driving for so many years, I really don't recommend mixing engine oils from different brands. Once during a long business trip, my oil light came on, so I casually bought another brand's 5W-30 and added it. After just a few hundred kilometers, the engine started making a buzzing noise. At the repair shop, they found that mixing the oils caused additive conflicts and sludge formation, reducing lubrication effectiveness. The mechanic explained that different brands have vastly different formulations—base oils, anti-wear agents, detergents, etc.—which may not be compatible. Prolonged mixing can accelerate part wear. Unless it's an emergency where you're low on oil and need a quick top-up, it's best to stick with the same brand and viscosity grade. Trying to save money this way can end up costing more in repairs. Taking good care of your car with regular maintenance can avoid such troubles.
