[chronomafia]

You give very vague information on the car. LOL
If it runs and has 12 quarts of oil. Wow. I had a crown vic that was like that and I drained it and refilled with new oil and filter to the proper level.
It knocked and smoked really bad. After the changed it ran great. The camaro could either have a blown head gasket and coolant leaked into the oil or someone could have just been really ignorant.
Engine damage could be bent piston rods, hyrdo-locked motor, bent push rods and a number of different things