Can motor oils be mixed?

[McElijah]

Motor oils can be mixed, but it is not recommended for long-term use. If the mixing is done strictly according to the mixing principles, it will not have much impact on the car, but mixing different types of motor oils may cause turbidity. Introduction to motor oil: 1. Since different motor oils contain different chemical additives, these chemicals may react when mixed, reducing lubrication effectiveness and potentially forming acidic or alkaline compounds that accelerate corrosion of engine components. 2. Most motor oil dispersants and detergents use sulfonates, while some dispersants are salicylates, and these two types are incompatible. If two lubricants are mixed, phenomena such as layering, turbidity, and reduced cleaning capability may occur.

[Bonnie]

When it comes to mixing engine oils, I have to be honest—it's best not to do it. Think about it: different brands of oil have vastly different formulations. For example, additives in synthetic and mineral oils can easily conflict, potentially forming sludge or sediment when mixed, which can clog the engine's oil passages. I once saw a friend take shortcuts by randomly adding different types of oil, and the result was increased engine noise, reduced power, and eventually a costly engine repair at the shop. To protect your car, stick to the same brand and viscosity of oil, and change it regularly on schedule—don’t add unnecessary stress to the engine. Remember, in an emergency, you can temporarily add a small amount of a similar type, but drive straight to get a full oil change afterward to avoid long-term risks.

[OColeman]

In long-distance driving, if the engine oil is running critically low, temporarily mixing in a different brand as an emergency measure is acceptable, but only in dire situations. I once experienced oil shortage on the highway and added a small bottle of a different brand's 5W-30 oil, managing to drive home without issues. However, never assume this is a convenient solution—mixed oils will undoubtedly degrade performance, significantly reducing lubrication effectiveness and accelerating engine wear. It's best to regularly check oil levels and keep a bottle of the original brand for emergencies. If you've mixed different oils, drive no more than 50 kilometers and replace it immediately to avoid additive reactions. Engine oil demands careful handling.

[VanMaya]

Mixing engine oils carries significant risks, primarily due to incompatible formulations. The base oils and additives from different oils can conflict—for instance, the high-temperature resistance of synthetic oil might counteract the oxidation protection of mineral oil when blended. Viscosity differences also matter; mixing 5W-30 and 10W-40 affects flow properties, increasing friction. To safeguard your engine, stick to a single brand and specification of oil and change it regularly for peace of mind. Always refer to your manual when selecting oil.