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It's only thinner on super cold starts; where the oil is too thick to lubricate any way. Running down the highway, with the oil completely up to temperature (which is different than coolant temperature) , there should be no difference in thickness.
Unless the 0w-30 is missing something that your engine needs (M1 0w-30 is light on ZDDP), it's going to work great for your engine.
Cost is up there, though.
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