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Let's say you were to mix one quart of 5W-30 with one quart of 20W-50.
Do both quarts effectively flow like a 20W-50 now because that half of the mix is slower to flow and basically "blocks" the flow of the 5W-30, or do you essentially create a 10W-40 with the two different viscosities averaging out?
Do both quarts effectively flow like a 20W-50 now because that half of the mix is slower to flow and basically "blocks" the flow of the 5W-30, or do you essentially create a 10W-40 with the two different viscosities averaging out?