I bought a 1998 Boxster 2.5, did I make a huge mistake???

[Ckrikos]

I don't think they are ticking time bombs, but they will cost a bit to maintain. The 2.5 has a dual row imsb that is less likely to fail than the later single row bearing. The only thing I would worry about with your car is the low mileage. A small number of the older cars had porous engine blocks that would show problems before 50k miles. You are probably ok though due to age and mileage. Enjoy the car. Did you get a good deal?