I have a 92 bmw 325i. I had noticed that my upper radiator hose was leaking. So i changed it. While changing it i had lost some antifreeze. I had no anti freeze at my house but i didnt want the car to run with low anti freeze. So, like a dumb a$$, i fill the rest up with water. Ever since then i have been losing antifreeze like a mo'fo. My friend said that it is a sign of either a blown head gasket or worse, a cracked head. I had changed the oil a couple of days before the hose. But i don't remember seeing the coffee looking oil effect that comes from a blown head gasket. What should i do?