At 155k miles, you need to be ready for a transmission problem. And it's at the age where if it hasn't been done, you'll need to start dealing with suspension, boots, rubber, weatherstripping, seals, hoses, plugs, filters, fluids, timing belt, etc. If things have never been replaced, now is the time they'll begin to die: water pump, alternator, etc. So have a repair budget in mind. They may last forever, but they're not maintenance free. And a car that has gone 155k with just regular service is bound to start costing money in repairs for the simple reason moving parts don't last forever and ever.