Can I Mix Different Oils?

Is it safe to combine different oil brands or types?

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Yes, it is generally safe to mix oils from different brands (such as Mobil 1 with AMSOIL) or to combine synthetic oil with conventional oil. Nowadays, most synthetic oils are compatible with conventional oils and can be blended together without issues.

Why You Might Want to Avoid Mixing Oils

Just because you can mix oils does not mean it is the best practice. Here's why:

Even though AMSOIL motor oils are designed to be compatible with both conventional and other synthetic oils, mixing them can decrease their life expectancy and degrade performance. AMSOIL does not support extended drain intervals when oils are mixed.

The Composition and Balance of Motor Oils

Each 'oil formulation' consists of base oils and additives carefully selected and blended by oil companies to meet specific performance goals. The additives in these formulations are balanced to complement each other.

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Every oil company has a unique 'proprietary oil formulation' for each of its brands, which differs from the formulations of other companies. Altering this formulation can be risky.

For example, AMSOIL employs specific base stocks and additives for its Signature Series formula and different ones for its OE Series. Mixing oils with different additive packages can interfere with the intended synergistic effects.

Why Aftermarket Additives Aren't Advisable

Mixing oils can upset the chemical balance of the blend, and this is also why adding aftermarket oil additives (like "Slick 50", "Dura Lube", etc.) is usually a bad idea.

When you use a well-formulated motor oil, additional additives are not necessary and could negatively react with the original additives. Avoid aftermarket oil additives to maintain the quality of your oil.

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