Can Car Engine Oils Be Mixed?

[LeTravis]

Car engine oils can be mixed, but it is not recommended. The reasons are: the formulations of different brands, types, and viscosity grades of engine oils vary, and mixing them together will not yield the same effectiveness as using a single type. Engine oil, also known as motor lubricant, is composed of base oil and additives. The base oil is the main component of the lubricant, determining its fundamental properties, while the additives compensate for and improve any deficiencies in the base oil's performance. The method for changing engine oil is 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 engine oil.

[HenryMarie]

I've known since my younger days driving heavy trucks that mixing different brands of engine oil is a major taboo. Each oil has its own specialized additive package, like detergents and anti-wear agents. Mixing them can cause chemical conflicts, leading to sludge or sediment formation, clogging filters, and accelerating engine wear. Once, I took a shortcut by mixing in some other brand, and the engine noise became as loud as a tractor. The mechanic said the lubrication effectiveness had dropped. So now when changing oil, I stick strictly to one brand and viscosity grade, like 5W-30, without compromise. This also reminds us that regular oil changes are crucial—don't wait until problems arise to regret it. Simply put, sticking to one specification is the way to protect your engine.

[SanHarmony]

Hey, I usually like to tinker with cars. Mixing engine oils? Really, don't try it. Different brands have different formulations, and the additives can conflict, causing a sharp drop in lubrication performance. The engine can easily overheat or stall. I remember a buddy who mixed oils, and his engine light came on. It turned out the viscosity change increased friction. If you ask me, saving money isn't the point here—just stick to the same brand when changing oil. Checking the oil condition during maintenance is crucial to ensure purity and extend engine life. Follow the manual for oil change intervals—mixing only causes trouble. Play it safe and avoid unnecessary tricks.

[MacElle]

I've been driving for years, and you should never mix engine oils. Different brands have conflicting additives that can weaken the oil film and accelerate engine wear. It's best to stick with one brand to avoid risks. Don't slack on oil change frequency either—do it regularly every 5,000 kilometers to keep your vehicle safe. Simple rule: mixing oils is risky, sticking to one specification is the safest.

[Don]

For safety reasons, I strongly advise against mixing engine oils. This can lead to chemical reaction disorders among additives, increased risk of lubrication failure, and may cause engine overheating or abnormal wear. I recall news reports of oil passage blockages occurring after someone mixed oils. Therefore, always maintain consistency when changing oil by selecting the same viscosity and standard. This also relates to driving habits—regular maintenance can prevent major repairs and ensure driving safety. Mixing oils might save small amounts of money, but the repair costs could be much higher.