Well there is no extra labor as the thing is out already and I think the part runs about another $100.00 or so. Myself I do not replace them unless they show signs of leakage. That is pretty rare on the first interval and by the time they are 140,000 or so I see about 1/2 of them needing them. I see idler bearings going out just as much if not more than the tensioners leaking or failing. You usually hear the idlers squealing in the morning when it is cold.


Rule 308