Is it okay to mix a small amount of engine oil?

[McDamian]

Engine oil should not be mixed, and it is crucial to avoid mixing different types of engine oil. Here is some relevant information about engine oil: 1. Engine oil is the lifeblood that maintains the engine's vitality. It serves to cool and lubricate engine components, ensuring the normal operation of various moving parts in the vehicle, reducing operational resistance, lowering temperatures, and minimizing wear. 2. Improper use of engine oil can not only shorten the engine's lifespan but may also lead to engine failure. 3. New car manuals specify the maximum interval for oil changes. However, the first oil change for a new car should occur after a shorter mileage. Subsequently, oil changes should be performed every 5,000 to 10,000 kilometers.

[DelAlex]

That time I was on a long drive and almost ran out of engine oil, so I mixed in a bit of a different brand as an emergency measure. The car didn't break down on the spot, but I later learned that significant differences in oil formulations can cause additive conflicts, leading to sediment formation and impaired lubrication. Engine oil is the lifeblood of an engine, and viscosity mismatches can also cause foaming and accelerated wear. So here's what I've learned: unless it's an emergency oil shortage situation, like not being able to find the same type on the road, try to avoid mixing oils. Small mixtures, say within 5%, might have minor effects, but long-term safety isn't guaranteed. It's best to develop the habit of regularly checking the dipstick and topping up with the recommended oil in advance.

[EvelynDella]

I always feel that mixing engine oils is too risky. Different brands of oil have varying base oils and additives, and even small amounts of mixing can cause chemical reactions, leading to sludge formation or reduced oil film strength, which can wear out the engine internals. Take my own car as an example—after trying to mix oils once, the engine noise increased, and it only returned to normal after changing to fresh oil. Oil compatibility is crucial, especially when mixing different viscosities or synthetic with mineral oils, as the problems can be even worse. My advice: if you absolutely must mix oils, keep the ratio below 10% and immediately visit a professional shop for an oil change. Normally, stick to the same brand of bottled oil to ensure consistency—that's the safest approach.

[DiIsabel]

As an ordinary car enthusiast, I've researched that mixing small amounts of engine oil is theoretically tolerable, but carries high risks of formula incompatibility. Different base oil types can accelerate oxidation, and additive conflicts may corrode components. For example, mixing semi-synthetic and full-synthetic oils in small quantities might not cause immediate issues, but would affect overall viscosity performance. Therefore, I never mix oils arbitrarily, only using the same viscosity grade to avoid potential problems. Daily oil level checks are more important to ensure smooth operation.