My 97 4Runer SR5 with 132000 miles needs the following work that I hope to do myself: timing belt with water pump, Tstat and associated parts, muffler, rear axle seal, rear coil springs (sags a bit), and repair of the code P0306 that is in another post, at this point looking like a fuel injector. Everything else works.If I do all this work, can I depend that the vehicle will go to around 250K miles as I have been led to believe? It has been babied since I have owned it from 76K miles, and by the previous original owner. There are two tiny spots of rust on the bumpers. The rest of the body is very nice. Interior is perfect. Did front brake and rotors last year,new tires the year before. Average 15K miles a year. What do you think? Should I do the work or sell it?