Same problem as always. Coolant in the oil.

Thats a fairly large leak and should be easy to find, if I'm not mistaken that would be about the height of the intake manifold below the filler neck. You could try this, get a radiator pressure tester and leave the plugs out and see how long it takes before pressure drops this will tell you how bad the leak is. The reason for leaving the plugs out is if the heads are cracked then without the engine running there will be water in the cylinder that is at fault.