What happens if you mix oils

Mixing Engine Oils. Was this article helpful. Sorry about that Any suggestions - Ideas to improve the quality. Thanks for your feedback! Add Your Comments. Incorrect word s in your text, please rectify. Your comment should contain at least 5 characters. Preeti 1 year ago Nice article, Great information about automotive engine oil. Gandhar Oil produces best engine oil in India. Lars 1 year ago Pilipo I have a lot of different clean left over oils, semi synthetic 10w Read More Did you try it?

I am going to be doing the same with my motorbike. Pilipo 2 years ago I have a lot of different clean left over oils, semi synthetic 10w Read More 1 Reply. Continue reading. See what our community has to say! Can you mix two different brands of motor oil in your car if they both have the same viscosity e.

Even if two different brands of oil have the same viscosity, you still should not be mixing them together. Why anyone would even consider doing this in the first place is something we cannot comprehend. But we digress. However, if you combine two different brands of motor oil, you could be at risk of damage. Engine rattling: Why did it happen after my oil change? The reason is that every brand of engine oil is formulated differently , especially with regard to the additives used by its manufacturer.

Nobody, possibly except for the top scientists and engineers working in these oil firms, knows the chemistry of their engine oils.

Besides, mineral oils are all byproduct of the same petroleum feedstock. When you mix different weights of oil, due to the varied amount of additives in the two oils, it may not provide the same efficiency compared to when you use one of the oils constantly.

Different oil viscosities do not separate or react negatively, and this is because the base oil is almost the same in terms of molecules. Various car engine oil manufacturers have assured their customers that it is definitely safe to mix different weights of oil.

For example, 5W30 has low viscosity and 10W40 has higher viscosity; when these two oils are mixed, the resulting blend will simply have viscosity characteristics thicker than 5W30 but thinner than 10W40, and this poses no harm to your engine. Your engine typically performs. Nowadays, synthetic oils are fully compatible with conventional oils, so you can mix the two. Table of Contents.