Mechanical seal behind the water pump.
Well you have a leaking somewhere that is allowing the oil and coolant to mix, you may need to tear the engine down to find it. Does it have an oil cooler, if so that may be the source as well.
SOURCE: Lexus ES300 White smoke out the exhaust no milky substance in oil
It could be the intake gaskets or even still the head gasket. How about the coolant ? Did you refill with same type coolant ? Have you noticed if it's thick and gooey ? mixing coolants will sometimes produce a thick gooey coolant that clogs up the cooling system. If the car ran hot it could also be a cracked head or block. Warped heads also. Somehow the coolant seems to be getting into the cylinder(s).
SOURCE: I have a 2000 chevy venture with a blown head
sorry but that stuff only works for awile.just get the head gasket replaced.
SOURCE: Engine oil moisture
Known issues or not,It sounds like the head gasket is blown,or it has a cracked head.If it was water it would be thick and light grey in color on the dip stick,But yellow indicates antifreeze leak that has not had time to mix with the oil.
I know that this is going to sound like of dumb but I would check and make sure your thermostat was installed the correct way. I had a similar issue once, after replacing the entire cooling system on a 750iL it still over heated, turned out I put in the thermostat the wrong way. Always check for little mistakes first:) Hope this helps and please don't forget to rate me.
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