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When you change antifreeze an air pocket is created in engine behind thermostat. You must let it run until the thermostat opens. Until then, liquid will boil backfkowing through bottom of radiator.
As for milky look, blown headgasket would cause white foam that if left alone wouldclear up. Otherwise it could be an additive in the fluid such as rust preventative.
The main reason for oil in the cooling system is a failed cylinder head gasket. The gasket needs replacing. Which in turn requires quite a bit of mechanical know how and a work shop manual for the car.
Failure to deal will lead to increase engine wear of even seizing.
Meanwhile keep an eye on your coolant, make sure you have enough in your radiator & header tank, also keep an eye on your rear view mirror, if a load of white smoke starts coming out of the exhaust, your head gasket has gone big time and you're wrecking the engine.
Another reason is many, many long short journeys where the engine hasn't got hot enough to burn off condensation in the engine, if you take of your oil filler/rocker cover cap and and look inside, if you see a load of oil/water emulsion, looks like a dirty mayonnaise, this can be what has happened.
It needs an oil change, goo clearing out and all the breather pipes cleared. Otherwise the engine suffers a lack of lubrication and the main bearings fail.
As you are probably aware, oil and water don't mix, they form an emulsion and the oil no longer lubricates yet coats everything with a dirty off white goo. I would strip the engine down and clean everything. You may get away with heating the engine parts to evaporate the water but I wouldn't recommend it. Sorry but if you want a bit more life from the engine, strip it down.
you have antifreeze getting in somewhere as it's the only thing that will make oil foam up and get a gooy greyish white color....you might check to see where it shows up strongest and check that part of the engine closely for a leak...
I would think that the brown goo is most likely to be caused byworn piston rings or valve seals which are allowing unburnt oil to be expelled into the exhaust system. The other thought is that it may be a coolant leak such as a head gasket problem which is allowing steam or water into the engine and then exhaust.