I have a 98 Bonneville SSE. The cooling system uses dex cool. Friday the low coolant light came on and went off right away. Saturday the light came on so I bought dex cool and refilled the tank. Today the car took a sh*t. The oil has dex cool in it. I was told that it was probably the head gasket, but here's my problem the car has 80,000 miles on it, is it common that such a large part should go when the car is not that old? The car is out of warranty and I've only had it for a year. Could this be a problem with just my bonneville or does anybody else have this problem. I take my car every 3,000 miles for oil changes (I even use vavoline max life oil for cars that have over 75,000 miles)I have had it tuned up in April (using the best parts on the market) I have also replaced the sending unit for the fuel tank, and put new brakes on it all the way around with drums and rotors. Is my car a chronic lemon or is this happening to anybody else?