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A question for the oil experts: Can you mix different viscosities of oil together?

The other day I was changing the oil in my DRZ400s. My first added quart was 20-50 non-sinth. Then I realized that it took 10-40w. So I switched to the 10-40 non-sinth for the rest of the refill. Will the two grades mix, or will they layer due to the different weights? It’s not a big deal to drain and refill again, but I don’t like to waste the oil. Any help would be appreciated. Doug.
 
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