It could be the oil is thick due to the cold and/or some of the old oil has mixed with the new to make it thick too? It seem that you are willing to "go inside", I would suggest you give it a good cleaning and keep it dry of oil. If you do lube it, use a product that will not change viscosity in the cold or gum up with age. Maybe, powered graphite? I'm not a gun smith but several read this forum, maybe one of them will suggest a better product to use. The symptoms sure sound like bad lube gumming up the workings.
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