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That is pure bogus information. You can mix dino and synthetic and across weights. Mineral oil is used in aviation. I've never heard of it being used in consumer automotive applications. I always use Mobil 1 in the manufacturer's recommended weight. But if you're a quart low, you can add anything without causing any problems. But I would stick to the recommended weight, which can usually be found on the oil cap in newer vehicles.
I try to help others that are still learning automotive stuff as much as possible but then some wise guy has to come along and calls me a liar.
There is no harm in mixing dino with synthetic. It is done all the time with blended oils.
Mixing across weights has no appreciable effect other than a minor change in the viscosity.
You can't completely drain a motor, and people change oil weight in some climate zones based on Summer vs Winter oils.
Don't take my word for it, check with Bob the oil guy, or a reputable mechanic for that matter.
You can mix conventional with synthetic all day long. They are the same basestock made from crud oil. There are a few GTL oils coming out but they're still a hydrocarbon product. I wouldn't suggest mixing the different viscosities unless you know the formulation. Many will use Viscosity Index Improvers that can cause issues when mixed with others. The real question though is why would you want to?
The real question though is why would you want to?
Yeah, just buy a purpose-made blended oil at that point if price is an issue...
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