A somewhat related topic, the freewheel on my winter beater/commuter kept freezing up at temps below -10º F and the pawls would get stuck. I cleaned all of the grease out and re-lubed it with Finish Line chainlube. (The "wet" stuff designed for dirty environments) It's a bit thicker, and doesn't seen to drip out, yet it hasn't frozen up yet and I've ridden down to -20 or so.