I have had 2 '97 Jeep GC since they were new. Last week got a terrific deal on a 2011 GC Overland hemi loaded, with only 16K miles. It was well taken care of and previous owner said he waxed it monthly. I down loaded the the owners manual-it only had 593 pages-are they kidding me? The manual that came with it only had 65 pages. I'm going to do the oil change with Castrol 5-20 and had a hard time finding oil filters. Finally located 2 WIX 57502. I would have loved to change with synthetic but it seem as though it would mess up the MDS. Lot to learn about this vehicle and it seems as though this forum is a good place to start.