Depends on the maitenence history, and how you treat it... if you have never had to replace anything in the past and you broke 143K miles Id say you are doing pretty good. Keep taking care of her and she will continue to treat you well. Usualy at higher mileage things that like to wear out are; wheel bearings, brakes (Depending upon when they were replaced), water pumps (also depending on when they were replaced), did you just purchase the car? Do you know its maitence history?
Things to be careful of on a CSVT are the differentials, the 3rd gear syncros tend to be a jerk also. Dont burn the tires, EVER. Unless you want to put an LSD in there, and avoid high speed right hand turns, the duratec has a small issue with them creating oil starvation and possible rod bearing failure, fill the oil about 1/2 quart past full, this tend to help a little.
