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HEadgasket failure, internal oil cooler leak.
cracked head or bad gasket
You possibly have an internal water leak in the engine, ergo, a cracked block.
Internal engine antifreeze leak what else could cause besides headgasket? there is no antifreeze in the oil it is clean
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.
antifreeze leaking into the oil pan
change your oil as many times as it takes to stop your oil from turning milky. if after four oil changes it doesn't fix the problem then you may have an antifreeze leak going into your oil, if that's the case hope it's a head gasket seal, otherwise it could be a crack in the cilinder
Probably a blown head gasket. If the car has an (engine) oil cooler it might be a leak there too.
Blown head gasket.
Yes antifreeze is sweet smelling, burning oil stinks and gasoline is, well gassy.
No the engine is not ruined. It needs a new head gasket and an oil change after the gasket been changed.
A gm 3.8 l v6 or 3800 cc engine cannot have antifreeze in exhaust without first getting into the engine. If its getting into the exhaust it may be entering the cumbustion chambers through a damaged cylinder head or head gasket. Also this engine depending on the model year may have issues with the intake manifold gasket, that can cause antifreeze to leak into the engine oil.