The answer to your question is yes.
The question should be rephrased "if I mix a 5w20 and 5w30 what criteria should I use."
Ideally:
The oil should be the same brand and within the same product range within the brand.
The resultant viscosity should be within the range recommended by the OEM.
The question should be rephrased "if I mix a 5w20 and 5w30 what criteria should I use."
Ideally:
The oil should be the same brand and within the same product range within the brand.
The resultant viscosity should be within the range recommended by the OEM.
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