I have an update. Had it towed to the dealer and they ran the car for 2 hours. No overheating, but more oil left the crankcase into the cooling system (about 2 quarts). They are suggesting doing the head gasket again and replacing all parts (radiator, hoses, coolant reservoir) at a cost of 4K! I asked them about the oil cooler and they said that wasn't the problem. They didn't test it, but they said it wasn't the problem. Does the radiator have anything that would allow oil into the coolant.