It's not impossible, but more likely caused by a head gasket.
intake manifold gasket if it is coolant in the oil
yes it can water can leak into the intake valley and get into your oil resulting in milky oil
A bad intake manifold or manifold gasket can cause water to leak into the oil. Some newer cars have plastic manifolds and they will crack from age.
if water is in oil,could be a bad headgasket!have it checked out!or a bad intake gasket.
The intake manifold is leaking coolant into the lifter gallery. There are 4 water jackets in the intake. one on every corner. Chevy's are none for this. It is a common problem. Need to replace INTAKE GASKET and change oil and filter. May need to change a few times until oil is clean and not milkey. Oil should be clear.
It can allow water to mix with the engine oil and destroy the engine.
Intake gasket leaking on the inside of engine.
You just drain the oil and change the filter. Although, if you've got water in the oil, you probably have a leaking head or intake manifold gasket, and should replace it.
The MOST COMMON PROBLEM with that engine is that the intake manifold gasket BLOWS / LEAKS water into the engine crankcase and mixes with the oil. Replace the intake gasket and FLUSH The engine oil and change the oil filter SEVERAL TIMES Untill engine cleans up.
had the same problem. my son is a ASE master rated gm tech, he said the 4.3's are bad about blowing the intake gasket. i just did a 96 blazer, water in the oil . pulled the intake and a blown gasket was the problem. hope this helped, BJ
The easiest way to ruin it is by running it without oil. Adding water to the oil or air intake would also do the trick.
If you're noticing oil mixing with coolant, possibly a bad intake gasket or head gasket.