What does the owners manual say? If the engineers wanted a different weight of oil in the car based on climate or mileage, it would be in there. But that thinner oil is needed more than ever to get to the parts of the engine as fast as possible. The channels in which the oil travels in were designed with that weight in mind. The car has lasted 150K miles on 5W-30 so why wouldn't it continue to do so? I say stick with the recommended oil until the car dies.
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