I do think that you have a coolant leak, though not much. Running it with out going out driving to get the oil hot enough to dissipate moisture is crazy. Find your slight coolant leak, fix it. If your not going to drive it, winterize it by fogging the motor with something designed to do that, and stop starting it for 5 minutes every month.
Your fuel is probably bad, should at minimum have fuel stabilizer, all of this is worst case scenario for everything in your engine.
