This is not my post but I put part of the 30,000 miles service info here…
http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=28809
At 30,000 miles you need to change engine Oil and filter, inspect/change air filter, replace spark plugs, inspect/change PCV valve if necessary (just change it, it’s less than $10) and inspect the transfer case fluid, aid if necessary.
I changed out the front and rear difs as well as the center diff so if you’re not going to do that it’s just the oil change, spark plugs, and PVC valve. I think the spark plugs and PCV valve ran me another $170 and the work was done at Straus Discount Auto in Brooklyn I try to let you know tonight which spark plugs I used but I think they were the Bosh twin tip platinum versions.