I recently suffered a head gasket going out on my 99 gmc suburban. I just started using your engine oil treatment less than 1000 miles before this event. My mechanic and I are convinced that had I not put the Lucas Oil treatment in the motor when I did that the engine would be a lot worse off, and I may have ruined it completely. I'm glad I found you when I did. Thanks for a great product. You've most likely saved me from having to replace the whole motor. Thank You.