In the winter you want to make sure that you winterize the lawn mowers. There is a process for this and if you do it every fall before it gets too cold, it will help your lawn mower to last longer. Add fuel stabilizer to the gas in your lawn mower engine before it gets too cold and you store it for the winter. The gasoline inside of the engine begins to degrade in as little as a month. This can cause clogs in the fuel system in the spring.