at 120,000 the car is scheduled for a 'major service' which is the usual oil change, spark plugs, fluids and filters. The most important thing on that car is the valve adjustment and that needs to be done to maintain engine performance and fuel economy at this time.The timing belt and water pump should be replaced every 60,000 or 7 years on that car. if you haven't done that to this point, you're over due.figure about $300 for the major service and about $350-$400 for the timing belt, drive belts, coolant and water pump.That is a great investment as that car will go to 400,000 miles with no worries as long as you follow the care and feeding instructions.You don't need to do both at the same time, but you do need to do both.hope that helps,