I have an '06 base 4cy w/ 4wd 127k miles that's not in the best cosmetic shape but I try my best to keep up with it mechanically. I finally have a garage to do proper work, instead of laying in the street. It's hitting that point where a lot of stuff goes out at once and I'm keeping on top of it but want to know what you keep around as spares and what essential preventive maintenance needs to be done to prevent a bigger repair. I've recently replaced a faulty alternator and the belt while I was at it, plugs, brake pads, the rear bumper metal piece because someone hit me and took off, and had toyota do an engine flush. oil and air filters I do on a regular basis.