A bad head gasket is the most common cause of antifreeze mixing in the oil. The antifreeze will dilute the oil and it will eventually cause your engine to seize up.
You may have a head gasket problem or a cracked head, engine oil is mixing with the antifreeze.
No the engine is not ruined. It needs a new head gasket and an oil change after the gasket been changed.
The antifreeze/water mixture is too weak for the conditions or you have engine oil or trans fluid mixing with it
if he means antifreeze is getting in the oil you could have a bad head gasket or even a cracked block not good either way
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.
Could be oil mixing with antifreeze indicating a bad head gasket Are you losing motor oil?
If there is motor oil in the antifreeze reservoir there is a good chance there is also antifreeze in the motor oil. This condition is probably the result of a bad head gasket or a cracked head. Antifreeze mixing with motor oil is a recipe for disaster for the engine. Have a trusted mechanic diagnose the situation soon as possible to hopefully avoid even more costly repairs.
Look at the oil on the dipstick. If you have antifreeze leaking into the crankcase the oil will be milky.
you have a blown head gasket
Intake gaskets have failed.
Antifreeze in the oil of any engine means there is a crack in the head gasket, or worse, in the block.
If it can be seen it will be on the dipstick when you first pull it out. Also check in the rad for traces of oil floating.