Mixing Synthetic and Mineral oils

Someone said, "try not to mix mineral and semi-synthetic oils, as they will separate."

Into what? I hear this from time to time, and it really makes no sense. Semi-synthetic is a blend of synthetic and mineral base oils, and they don't separate in the bottle, as far as I know. And the actions of the motor would seem to me to stir the different oils up pretty well even if they did separate.

I think this is an old wives tale/ urban legend.

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