2000 Jeep Grand Cherokee Laredo In-line 6 cyl. 4.0L review from North America

We purchased a 2000 Grand Cherokee Laredo in Feb. of 2004 with 61000 miles. on it. When we first bought the vehicle, we really liked it because it seemed to be a great value for the price. That was until we got it home the first night and the check gauges alarm beeped because the engine had lost all oil pressure. Their explanation was that the previous owner had never changed the oil and the engine had to be overhauled. New rings, bearings, gaskets, etc, the whole nine yards. We bought the extended warranty on the vehicle, but since it broke down the first night, the dealer picked up the cost of the repair. So everything was fine, we had a vehicle with basically a new engine right, wrong! After a few months it started using coolant. Took it to a dealership and the pressurized the block and said there was no leak pressure loss in 15 minutes. It has been about 23500 miles now since the overhaul (500 miles left on the warranty) and the engine has started loosing oil pressure again. My assumption is that there is a crack in the head and coolant is getting into the oil and they didn't catch it last time and simply blamed the old owner. Is this a common problem? I have read a couple articles on-line that sound familiar. It is going into the shop tomorrow and the jeep place close to where we live now seems to take really good care of the customers, so I feel fairly confident they will fix it. My concern is will it be fixed for good, or for another 24,000 miles?

Also replaced the rotors twice, but the second time I had the calipers replaced at this dealership under the warranty and did the rotors myself to save a couple hundred $.

Nice car with all the bells and whistles (that is mostly why we bought it, its my wife's car). I6 is a little sluggish and shifts a lot on hilly interstate, wishing we had the V8.