Originally Posted by ThetaTau87

Sounds like your car doesn't have an oil cooler, but if it did a leaking cooler won't allow much coolant into the oil. The oiling system operates at much higher pressure than the coolant system and oil will get into the coolant, not the other way around.

Your symptoms sound like a bad head gasket, cracked head or cracked block allowing coolant into at least one of the cylinders. There it will burn and produce a sweet smelling white smoke when running. When sitting the coolant will leak past the rings into the sump and turn the oil into a milk shake. If this is the case the oil level will be high due to the coolant that has leaked into the sump.

Don't attempt to start the engine or even crank it. If a cylinder is full of coolant it could split the block and/or bend a rod.

Originally Posted by James Bailey

True while running but once you shut off the engine oil pressure goes to zero but the cooling system holds pressure for a long time......

Originally Posted by ThetaTau87

Yes, some coolant can get into the oil, but much more oil will go into the coolant if there is a leak in the oil cooler. He said that there is a lot of coolant in the oil, but the coolant is still green. I don't think that is possible from a leaking oil cooler.