(Why anyone would even consider doing this in the first place is something we cannot comprehend. But we digress.)
See full version: Engine oil: Can I mix two different brands with the same viscosity
(Why anyone would even consider doing this in the first place is something we cannot comprehend. But we digress.)
Therefore, we as consumers cannot be sure that one oil does not affect another one. We don’t know their chemistry. here
Who is to say that when two oils are combined, their additives won’t end up cancelling each other out? That leaves an engine with less protection. [links]
Technically, using a grade of oil that’s recommended by your car manufacturer is correct. However, if you combine two different brands of motor oil, you could be at risk of damage. more
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For example, in the engine, you have conventional oil with 15W–40 viscosity and API CH-4 specification. It is desirable to select an engine oil with similar characteristics: same viscosity (15W-40) and comparable specification. Note: any oil that is not labeled exactly as the API states, does not necessarily meet the implied standards: The viscosity 5W-30 must be written this way. Anything like 5W30, 5W/30, or 5 W – 30 are not 5W-30 oils. They may or may not actually be the right viscosity, but they are not stating it, so not legally promising anything. And an oil that says it “meets” API SP is not the same as one that actually is registered and tested to assure compliance. here
The possible incompatibility of the bases from different manufacturers is not a problem – different manufacturers have different technologies and ways of producing the bases, which may eventually have different physical properties (this applies especially to synthetic motor oils), but they are interchangeable as long as the rest of the API guidelines are followed in production.
To prevent costly repairs and save you time, we advise you to have an oil change and as soon as possible if they are different viscosities, you have added mineral oil to a car that requires synthetic, or the only oil available was of an inferior quality specification.
If you do find yourself needing to mix viscosities, this calculator, combined with the specifications for the two oils can tell you what the resultant viscosity will be: https://www.widman.biz/English/Calculators/Mixtures.html [links]
Let’s put it that way: to achieve the same viscosity and temperature characteristics in a 10W-40 oil, for example, the manufacturers are solving completely different problems determined by the properties of their own base oil. A traditional synthetic does not need polymers to meet both the SAE 10W and SAE 40 viscosity targets, whereas a Group III synthetic needs a few, a Group II mineral oil needs more, and a Group III mineral oil needs a lot of polymers to thicken enough from 10W to 40.
However, in a simple fix, mixing two oils are not a good cause of some different things involved in what they have; the brands do have. All this mixing of oil is sometimes due to not understanding your car functions, reading the Manuel, and such. more
Synthetic oil is just little oil that draws and is too greasy. Choosing the right oil is the best thing to do, and there are various brands and varieties of oil that one can change or choose to go for. [links]
There is nothing too wrong about mixing tow brands of oil, thus, you might disregard our answer to the question, can you mix different brands of oil? However, are you ready to take the risk after the deed, and it is now affecting the engine? Gone are the days when they use only the real engine oil (real synthetic or mineral oil). more
Engines work differently. That’s why you see machines use fuel, and some others need diesel to power it on. The same goes for the oil, too, and reasons attached to it. The mineral oil is so expensive to buy, which is why synthetic is always used or sometimes topped to the real engine oil by some people.
Mixing of synthetic and mineral oil is a considerable risk because you are trying to save up but not knowing what you are getting yourself into. Synthetic oil is not well-processed oil and is very bad to engines, but mineral oil is a pure refined oil that even looking at it, you will know that it is pure and original.