Fog the Engine Cylinders
Aerosol fogging solutions coat the inside of the engine to protect it until spring. Each engine manufacturer makes proprietary products they promote as ideal for their engines. Hook "ear muffs" and a garden hose to the engine, start it, and then spray the fogging-solution lubricant directly into the air intake until it's gone. If you don't fog the engine cylinders, corrosion can form inside the engine, covering the cylinders, pistons and rings with a patina of abrasive crud. Cost if you do: $5 to $15. Cost if you don't: $2,500 to $15,000 (or more).