* Lubrication Failure: Engine oil lubricates all the moving parts. Antifreeze provides no lubrication whatsoever. Without oil, metal-on-metal contact will occur, leading to scoring, seizing, and potentially complete destruction of engine components like bearings, pistons, and cylinder walls.
* Corrosion: Antifreeze is corrosive to many engine metals. It will rapidly attack and damage engine parts.
* Seals and Gaskets: Antifreeze can also damage seals and gaskets, leading to leaks and further damage.
* Pump Damage: The water pump, designed to circulate coolant, is not designed to handle the viscosity and properties of antifreeze in the absence of proper lubrication. It will likely be damaged.
In short, putting antifreeze in your engine instead of oil is a very expensive mistake that will likely require a complete engine rebuild or replacement. The engine will likely be beyond repair.
