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Fore you pull the intake do the pressure test with the spark plugs out you may have a bad head gasket That is leaking into a combustion chamber thru and open intake valve and out the intake .
I would at least pull the exhaust elbows and look in the manifolds for evidence de of leakage
Depending on if it’s just water in the oil but not in the cyls, or it’s water in the oil and in the cylinders. If you have no oil in the cyls but water in the oil it’s not likely to be exhaust but possible a bad intake gasket, rotted intake water passage, blown head gasket(s) or cracked cyl heads or block.
So far, I have not seen any water in the cylinders. When I did the tune up, last week before I discovered the milkshake, I had all the plugs out and didn't see any water. I only pulled #6 today, and there was no water in it. I have not put water to it since Saturday morning. Now I'm doing multiple oil changes without water. I'll do a pressure test without plugs and see where that leads me.
