NOTE - I DID CHANGE THE OIL ON THIS JEEP BEFORE I GOT IT RUNNING AGAIN BACK IN 2010. LOL - now read on...... If you've been following along you know that it all started when I put my thermostat in upside down. So then it became a head gasket replacement. Then I thought 'Hmm, he was pretty smoky even before I blew the gasket, should probably do rings.' So today I went out and dropped the oil pan. Neat extra note here is there is a skid pad mounted to the pan as we all know but there was also a separate sort of a front chin/skid guard that mounts to the front 4 or so bolts of the pan. Looks stock, the lip covers the bottom of the crank wheel. So it started with draining oil. I open the drain plug and the first second or so of drainage is green flourescent mess. The guilt...... Then lots of non-detergent oil til it got to the drip drip drip........drip.............drip stage. Then I loosened the pan nuts and tilted it slightly to the plug side - sludge starts dripping and slithering and glugging out. A nasty "texture-of-brownie-batter" sludge. The guilt increases.... So then I replug the drain and drop the pan. Then I felt REALLY guilty. I should have done this the day I got it. The sludge in the bottom of the pan was no less than a quarter of an inch deep, maybe deeper, and was literally thick enough to stir with a screwdriver. It was higher than the cut out in the bottom flow-thru of the baffle at the back third of the pan. As I am scraping and wiping and scaping and wiping and dumping out mess etc I kept saying "I am so sorry Barn (Barney's his name, I didn't name him)...so sorry. I had no idea." Poor old guy! So now the pan is the next thing to be fully cleaned inside and out and repainted. Some shots of the mess as well as the underside of the block (kinda lame shots, my camera was dying, better ones to come) can be found here: http://s557.photobucket.com/albums/ss14/mwinks-jeep/ Enjoy:driving: jeep toss will happen soon enough!