My 4 stroke Mercury takes 10W-30 oil. I have been using Mercury oil but gonna use Quicksilver this time just a lil cheaper. I have some Mercury left over so can I mix that in with the Quicksilver??? I just don't want to waste about a quart of perfectly good oil and combined with a gallon it will be just enough. I know Quicksilver and Mercury are pretty much the same thing so this might be a stupid question

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