Hi everyone. I've had a '94 Thunderbird n/a V6 since August of 2002. It's been my daily driver and has been an excellent car. I've taken good car of it over the years, changed the oil and transmission fluid myself, put on some higher end brakes, and made a couple of mild mods here and there. A good deal of stuff I've learned about my car came from this website but one thing I've always wondered about is the 3.8L V6 and its head gasket issue that people run into. I've even heard about this issue first hand when my cousin's head gasket blew in his Mustang several years ago. My question is does a head gasket failure have to occur? I imagine it's possible that the previous owner of my car addressed the issue long before I ever came across the car but what if this isn't the case? What sets off a head gasket failure? The car has almost exactly 140,000 miles on it from about the 118,000 it had when I first got it 4 1/2 years ago. I don't drive the car very hard and I regularly use a synthetic 10W-30, usually Mobil One.