Alright, so I have a 1995 Legacy LS with 251,000 miles on it. The car has stories and I want it to have many more. I drive another car during the summer months as it gets 40mpg. I drive over a 9,000 foot mtn pass everyday (a total of 7,000 ft gain there and back). The engine light is on, and the diagnosis is an knock sensor. The lifters are making a noise and it is starting to blow a little blue smoke. For the most part the car runs fine (i.e, don't fix it if it ain't broken?) Since I am not driving the car during the summer months, I want to tune the car up myself. The question is, what would you recommend I do? I'm thinking timing belt, water pump, possibly oil pump, et. Since I live in the mountains and don't have a garage, I'm not real keen on working on the car during the winter, so I want to get it done in warmer temps and longer days.