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If you're doing the timing belt, and the car has ~150K miles on it. I would replace the hydraulic tensioner/the tensioner pulley/idler pulley/water pump/seals and of course the belt. If any of those seize up, you lose that belt, and a couple thousand dollars in head repair.
The serpentine pulleys are more forgiving and if you shread the sept belt, the car will still run (t-belt driven water pump) and you can get it somewhere to fix that stuff. Unless you really wanted to replace the idler and tensioner for the serp belt now, then yeah, prevententive maintainence is great!
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