As I begin my search for a '97 - '00 TJ I am facing the likelihood of high mileage. Most of the TJs out there in my price range (under 5K) seem to be the 2.5s and have somewhere around 150k or so on the odo. I'm not much of an engine mechanic, (actually not at all) but I think I would prefer a 4.0 because I'm pretty sure the higher mileage isn't a big issue as they seem to go forever. What about the longevity expectations of a 2.5 comparatively with all things like maintenance being equal? IOW..is the 2.5 more likely to cause issues as the mileage piles up?