you can start here: http://legacygt.com/forums/showthrea...ol-200435.html
there is a regular scheduled maintenance you should be sticking to. you'll need to address things like your timing belt, water pump, drive belts, are you turbo? if so, you'll want to inspect that.
258k miles - Stock engine/minor suspension upgrades/original shocks/rear struts replaced at 222k/4 passenger side wheel bearings/3 clutches/1 radiator/3 turbos