You've got a blown Headgasket. Don't drive it !
the most lkely reason of coolant leaks to the exterior of the engine is through a breach between the head and block. you should check the gasket first.
Antifreeze in the oil of any engine means there is a crack in the head gasket, or worse, in the block.
Antifreeze helps by not allowing the coolant to freeze and possibly crack the water passages of the block.
Spring towards the block of the engine.Spring towards the block of the engine.
If ice forms anywhere in the engine, it can crack the block.
You could have a cracked engine block.
it is not a cracked engine block it is just a loose block
crack the engine block and oil mixes with water or antifreeze.
Antifreeze, engine oil and engine parts on the ground under the vehicle might be a clue.
Usually this is due to the engine having frozen, normally due to insufficient or lack of Antifreeze. Or the failure of Block Heaters. Water expands when it freezes, metal contracts as it gets colder, consequently, the cooling system will burst at it's weakest point.
Your car shouldn't "burn" antifreeze. If it actually is "burning" antifreeze then chances are you have a blown/leaking head gasket or possibly a cracked engine block which allows antifreeze to enter the combustion chambers. If your antifreeze is just disappearing then it is probably leaking out from somewhere. Possible leak areas to check out would be the radiator hoses, heater hoses, radiator, water pump, and the heater core. Most of the time if the heater core is leaking you'll be able to smell the antifreeze inside the car while the engine is running and the heater is on.
Assuming this is a 4.3 engine, remove the block coolant drain plugs. There is one on each side of the block. The passenger side is towards the front of the block and the drivers side is towards the back.