If there is any coolant in the car, test its strength to see where it would freeze and compare that to temp the car has been exposed to-----------if good, you are probably lucky it had anti freeze as there should be no rust in the block----all you need to do on the oil is to just take the drain plug a little loose until you get a drip--if its oil there is no coolant in it-if is coolant, you got a problem--