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Mixing oils is not going to cause you to burn oil excessively. There is no harm done in mixing synthetic and regular, or in mixing viscosities for that matter.
However, there are different additives in different oils, some of which may "cancel out" any positive effects of the additives in a different oil. Is mixing oil the best thing, no. Will topping off or mixing oil on occasion do any damage to your motor like you're describing? Absolutely not.
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