90,000 mile service cost?

Actually, the timing belt should be replaced every 60,000 miles, so if you have not done it then you are over due according to the maintenance book online. A good quality kit with the water pump, the tensioners and the belt is about $200 plus the labor, which runs 6 hours, plus coolant. So, if the labor is $600 and the kit and coolant is $250 with tax then the T-belt job is $850 or so.