I have a 93 sedan deville with a 4.9L. I purchased this car for my wife to drive. It is nothing super fancy just a get around town car. Since I bought it and have started to do the usual maintenance I have noticed it has oil in the coolant. I am fairly mechanically inclined and am thinking this is a head gasket problem. But not being familiar with the cadillac engines I am wanting some more input. It is pumping a fair amount of oil into the coolant. Where should I start?