Great info provided by the others. I would add a couple things. I've used Startron fuel additive and it seems to work as advertised. Be careful running motor when not immersed in water. Doesn't take long to overheat rubber blades on the water pump impellers. When I kept my boat stored outside in the winter, I used to burn a single light bulb in the compartment I was worried would freeze. Heat from bulb was enough to prevent freezing.