The reason you put thinner oil in your car in winter is because it reaches operating temps faster. I believe oil freezes at a temperature of around -100 celcius, so unless you live in the arctic, you shouldn't have to worry about it. Since your chain lube doesn't need to reach an operating temperature and isn't under the same load as a car motor, It shouldn't make a difference on the weight of oil in summer vs winter. I just use the wet chain lube and use it often and clean my chain often, since the roads are always wet, salty and filthy.
Last edited by ScottNotBombs; 09-02-11 at 06:03 PM.