I've got a 4.0 OHV, 172k miles engine is still runnin like a champ. Just replaced a few parts on it recently and did a tuneup. Recently replaced water pump, power steering pump, idler pulley (broke), tensioner pulley, plugs, wires, pcv valve, and AC compressor. A few hundred bucks in parts for the last few years of service without fail and when I need to go somewhere I turn the key and go without reservation. I love my X and promise to not neglect it so much in the future for it's devoted service. Seriously tho, it's a great engine, gets decent mileage and has been relatively trouble-free.
Matt