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if you had a car with a real oil pressure gauge then you would run the thinest oil that let you keep your oil pressure up high enough to keep your crank bearings suspended in their cushion of oil, without this gauge you can kind of guess by telling how soon it takes for your oil pressure light to come on after switching the engine off in a coast, in the winter mine holds pressure for almost 7 seconds with 0w 30 oil, in the summer it holds pressure for almost 2 seconds with 0w 30 and 3 or more with 10w30 synthetic, being a new engine that should be broken in, I would say 0w 20 might work as long as it doesn't cause any problems, if you aren't sure then don't do it, it's that simple, if you are willing to take responsibility to make sure everything is ok, then do it.
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