I've always been a believer in synthetics, but after lurking around on this site, I'm slowly coming to realize that conventionals aren't so bad. I've been using synthetic in my 08 Wrangler (3.8v6) since I bought it new, but I've been experimenting with different brands and weights attempting to atleast mask the lifter tick that chrysler wont do anything about. First change I tryed PP 5w-20, and it didn't make a difference. Next was Syntec 5w-20, and it seemed to help a little, but near the end of the OCI, it got louder. Next up was Q.S. Torque Power 5w-30. This quieted it down as much or more than the Castrol, and seemed to last longer. Finally, I'm running RTS 5w-40 in it now, and surprisingly, it hasn't seemed to make a difference. I know my engine calls for 5w-20, but I've seen others on here run thicker oils in their engines with good results. I havn't noticed any fuel mileage decrease or a noticeable decrease in power, so I figure it can't be hurting much. Anyways, I have a case of GC to use up yet in the colder months, but I think after that, I might just switch to conventional and save myself some money. I've heard these engines are fairly easy on oil and the factory already recommends up to a 6000mile OCI on conventional, so I figure it can't be all that bad. I was using synthetic in it cause I do a lot of city miles, offroad with it alot, and it usually doesn't run below 195 on the coolant temp gauge in the summer. What do you guys think? Sorry for the lengthy post.