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I buy into the cold weather viscosity as being a drag but once the engine gets up to temperature having too thin of oil may increase metal to metal contact.
I normally run 15w-40 in the summer and 5w-40 in the winter. The 15w40 is cheaper. I have tried thinner oils in my fords and never noticed any change in economy. I would rather have the increased protection of the 40 weight equivalent.
All of my driving is at least 6 miles with at least one long trip on a tank.
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