Actually, I think the service interval is 70k and 140k etc. but anyhow, I did mine at 60 and 120. At 120, I replaced the tensioner (hydraulic type), tensioner pulley, idler pulley, water pump, belt, serpentine belt and obviously coolant.
The pulleys did not have any play but I did not wish to take any chances and also the water pump seemed ok but I dont want to go back in any time soon.
FCP Groton (nfi) had a kit that included all the parts [oem] and oil seals as well if you need them for around $330.
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