Engine runs but has steam coming out of exhaust pipe
The ONLY way coolant can get into the crankcase is through a crack in the cylinder head, block, or head gasket. THE ONLY WAY!.
Checking compression was a good idea, and you've confirmed that is not where the leak is. It could be somewhere else within a head, the block, or head gasket.
Any gasoline engine will blow steam from the exhaust pipe on start-up and a few minutes running. May even stink, depending on how sensitive your nose is to smell.
I think your going to have to dig deeper into this, if you truly had coolant in the oil. But to tell you exactly where to look is not going to be easy.
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