Can I Mix Different Oils?

Is it okay to mix different oil brands or types (i.e. synthetic oil and conventional oil)?

Yes, you

safely mix one brand of oil (e.g. Mobil 1) with a different brand

(e.g. AMSOIL) or conventional oil with

synthetic oil (in fact, that’s what a synthetic blend is). Most synthetics today are fully compatible with conventional oils and

safely be mixed.

However

, just because you CAN it doesn’t mean that you SHOULD. Let me explain.

Even though AMSOIL motor oils

totally compatible with conventional and other synthetic motor oils, mixing AMSOIL oils with other oil brands or types will shorten the oil’s life expectancy and reduce their performance benefits.

The

base oils

and

additives

that make up an

'oil formulation'

are carefully selected by the oil companies and blended together in a way that ensures that the finished product achieves the desired effect that they set out for it to achieve. The various additives in the ready-formulated oils are coordinated to each other and are properly proportioned.

For more information, please visit can you mix 2 different brands of oil.

Each oil company has its own unique 'proprietary oil formulation' for each of its various brands, types, and grades of oil; which in turn is different than another company's oil formulation for its various brands, types, and grades of oil. Any manipulation of this formulation has the potential to be harmful.

For instance, AMSOIL uses one type of 'base stock' (usually a blend of 2 or more base oils) for its top of the line

formula, adding its own specifically selected 'additive package' to it.

However

, it uses completely different base oils and a different 'additive package' for its

formula.

The function of additives blended for specific characteristics can be offset when oils with different additive packages are put together. Why? Because many of those additives are

, meaning that they interact and work together to produce an effect different from or greater than the sum of their individual effects (like the different ingredients in a cake recipe for instance).

Therefore

, since one 'oil formulation' might contain different base oils and additives (or different

percentages

of the same base oils and additives) than another 'oil formulation', it's usually not a good idea to mix and match different oil brands or oil types; you will only be upsetting the delicate balance (chemical equilibrium) of the blend.

This is also one of the reasons why it's usually a bad idea to add "aftermarket" motor oil additives - such as "Slick 50", "Dura Lube" "Prolong", "Z-Max", "Bestline", "Motor Up", "Oil Extreme", etc. - to your oil.

The bottom line is, when using a properly formulated motor oil, not only do you NOT need to add additional additives to it, but those additives can also react negatively with the additives the oil company has already carefully blended in. Do yourself a favor and stay away from aftermarket oil additives, regardless of how appealing the bogus claims are in their advertising.

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