Originally Posted by cp04
I'm no oil pro but I would say no. Most of the labels say that the oils will mix with conventional, blends, and synthetics.
You are correct as long as we are not talking blending or making your own "Cocktail"
No oil manufacturer recommends to intentionally blend not only different brands, synthetic or petroleum, but even not to blend different oils from the same manufacturer as additive packs may vary.
Mixing of an oil in an emergency is fine, most will be compatible for that but is always recommended to do a change ASAP.
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