I bought my son's 2003 Toyota Sport V-8 4WD with every option in flawless condition and was meticulously maintained. Just had four new brakes installed, new Michelon tires, and drive belt. About 75,000 miles on odometer.Questions: when should the timing belt and water pump be changed...or should I want until "something" happens? I don't intend to drive much more than 5000 miles a year (November to April): is one annual oil change adequate under these conditions? Any guess on "life expectancy" of the engine and powertrain? My impression is that this is an incredible vehicle...such a smooth, powerful engine and transmission as well as quality built!