I have a 2001 Jeep Grand Cherokee Limited 4.7L engine 4 wheel drive. I've had to replace a few things. I had to get the engine replaced! And that's one expensive engine to be going out after 3 years. We kept the oil changed every 3-5K miles. And the heater doesn't work. They say $800 to fix the heater because they have to take so much apart to get to it. I've already had the rotors and all replaced and a rear axle leak fixed as well. The coolant system had a leak. I've replaced one of the heated seats. Yep. I spent a crapload replacing things just before the engine went out!!!!! And I've heard from other people and mechanics that they've had to replace a few of these engines. But there is no recall as of yet. Maybe not enough bad ones or something. I would advise a very good and lengthy warranty if you are going to purchase one of these!