My 1998 maintenance manual says to "replace timing belt" at 90k miles or 72 months. It says nothing about a timing belt service, which I believe is something the internet has come up with. The factory service manual doesn't say to replace the water pump, pulleys or tensioner, only to inspect those items. An OEM Mitsuboshi belt costs only about $35. There are people, some on this forum, that suggest a thousand dollars in parts for this "timing belt service" that has been developed over the years through OCD escalation. Being only partially OCD I believe the case can be made for also replacing pulleys - which are not that expensive even for OEM. So I'm out about $100 for a timing belt job - and I kind of enjoy doing it. But there's no way I'm going to do it at 72 months when the belt looks like new, as it always does. But $2800 every 90k is beyond the pale - rendering the vehicle economically unviable in my view.