Im looking at picking up an 89 shadow tommorow 2.5 TI. I took it for a test drive today and when i pulled it back i the drivway somewhere near the rad it puked out a brownish mess. We then put more coolent in and it came out the same spot. What would this be. Could it have been oil in the coolent. Blown head gasket? Need help asap as im planning on putting a down payment on it tommorow.