I'm pretty sure worn tensioners killed my engine at 265k. So just depends on how long you want to run it, and how much money or time you want to spend. All the research I've done is its a much bigger job to do chain and tensioners than anything else on your list. And if I elected to do it, there is no way I wouldn't do the water pump. Most cars with 100k timing belts have the pump as a scheduled service item at the same time. Sent from my SM-N950U using Tapatalk