I have a 2010 JKU, It has 150,026 miles on it. I bought it with 2 miles on the odometer. This is all I have done to it so far:
1) I had a coil pack go bad at 147,000 miles, Cylinder 2 misfire - Code -- P0302. Cost 54 dollars for a new one at O'Riellys. 10 Minutes, changed myself.
2) Water Pump went bad at about 127,000 Miles. Cost was like 80 dollars at O'Rilleys. - 1 Hour to change myself.
3) Upper oil Pan Gasket started leaking at about 121,000 Miles, Cost was like 25 dollars at O'Rilleys. 1 Hour to change myself.
4) Clockspring went bad at about 98,000 miles, Dealer covered it under warranty.
Now the maintenance I do on it:
1) I religiously change the oil every 3,000 miles and I run Royal Purple 5w-20. I know probably overkill. Old habit from my grandfather that I just can't Kick.
2) I change Transmission fluid, filter and transfer case fluid every 60,000 miles.
3) Radiator complete flush every year.
4) Diff Fluids every 15,000 miles.
5) I run 87 Octane Gas
6) Change Air Filter as needed.
7) Changed Spark Plugs and Wires at 100,000 miles.