I have a 2008 Toyota sienna with 174530 miles. I've changed the spark plugs, the coils ,stabilizing arms, struts, and it still purrs like a kitten. The water pump has not been changed yet, it still runs great. I change the coolant every year and a half to two years, change the oil every 5000 miles as recommended, and do a complete transmission flush every 35,000 miles and I add half a quart of Lucas transmission fix to it as it adds polymers to the tranny fluid. On top of that I've added inline transmission and power steering filters to the vehicle. Great Dame little van. Just wondering when I'm going to have to change the water pump. who knows maybe I'll go out another hundred thousand before needed to change.