I'm guessing that it could be leaking from one of your core plugs ( also known as
freeze plugs , expansion plugs ) or your block heater if you have one , because that
is installed in one of the holes in the engine block and takes the place of a core plug
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.
Need to check the back to corners on the intake, they our none for leaking. There is 2 freeze plugs in the back of engine between the bell houseing and block.
Not knowing what year, make, model and engine you have I can only guess that you may have a rotted out welsh plug on the back of the engine block.
freeze plug has blown out or leaking
It would trash the engine bearings real quick. Antifreeze in the oil is a for sure engine getter. I just got done rebuilding a 98 350 vortec that had antifreeze in the oil do to the intake gasket leaking and all the engine bearings were trashed.
Antifreeze helps by not allowing the coolant to freeze and possibly crack the water passages of the block.
it could be a head leaking or the intake manifold, if its coming from the very top its most likely the intake manifold gasket
That's the engine ( block )
If ice forms anywhere in the engine, it can crack the block.
If it is motor oil in the anti freeze, then it is either a cracked head, cracked engine block, or a head gasket blown. If it is transmission fluid in your antifreeze, then the radiator is leaking from the transmission cooler ----- although usually that would cause antifreeze to be in your transmission fluid.
You could have a cracked engine block.
That means that there is engine coolant / antifreeze leaking into the engine and mixing with the engine oil. You must have an 1997---2000 modal V-8 or V-6 engine. It is very common for the intake gasket to leak coolant into the engine oil on those engines. Are you sure it did not freeze and crack the engine block ?? If you know that it had enough antifreeze in it not to freeze, Then you may get lucky and flush the engine oil and replace the oil filter several times AFTER you replace the intake gasket. OIL and ANTIFREEZE don't mix well and the antifreeze will destroy the engine BEARINGS.