Ha ha. We took the 08 JK and my 98 Chevy Blazer out in the mud last night. Some serious abuse to both mine and my girl's ride. The girl's JK threw some check engine lights on the way home, so I started pulling parts. Two codes were P0300 Random/Multiple Cylinder misfire and P0052 Bank 2 Sensor 1 O2 heating circuit. Pulled the plugs out and two of them were melted!!! Another two were cracked. O2 sensor was burnt too. 50 bucks later JK runs great again... But I just wanted to share. Guess Jeep just don't make 'em like they used to!! Ha. Also Champion plugs will melt under hard off roadin'. Just sharing my exprience. I'd upload a pic, but I don't have enough posts here... Have a great one.