I am going to be riding my old Murray bike thru the winter here in Metro Detroit, and it has a 3 speed Shimano 3S hub. Based on my experience with the petroleum based shock oil I had to replace in my mountain bike fork 2 winters ago so the thing would compress and rebound below 30f, I expect problems with the hub on my current bike at cold temps. Down as low as 0f. Colder than that and screw it, I'm driving or just not going!
What do I do to replace whatever lube is in there now with a synthetic lube that will stay a consistent viscosity? What is the intended lube? Where can I find service instructions for this hub?
I know this hub isn't the best, and reliability is a know problem, and I know that Murray isn't exactly know for high end bikes, but it's what I have for now so I have to make it functional down to 0f.