Cracked coolant port(s) in the cylinder head usually. Although, I’ve seen people put washer fluid in power steering reservoirs. So yeah pouring coolant directly into the engine could also result in this nightmare.
/Also in modern cars, the liquid/liquid oil coolers fail surprisingly often.
How would coolant get in there? A mechanical failure, or would someone have to literally pour coolant into the oil hole?
Cracked coolant port(s) in the cylinder head usually. Although, I’ve seen people put washer fluid in power steering reservoirs. So yeah pouring coolant directly into the engine could also result in this nightmare.
/Also in modern cars, the liquid/liquid oil coolers fail surprisingly often.