My wife took our Jeep GC to the dealer and had the oil changed once. Then when it came time to change it again, I couldn't get the plug to budge without seriously risking damaging it. I drove it to the dealer and told them whoever tightened up the plug way over torqued it and damaged it. I not only made them loosen it, but also had them give me a replacement plug. I vowed to do my own oil changes religiously from now on. The only reason my wife took it to the dealer in the first place was because it was in the dead of Winter. I guess I'm just going to have to freeze my ass off next time to know it's done right.