When does volvo V70 timing belt need changing?

98 V70 is recommended every 70,000 miles. 1999 through 2003 is recommended every 105,000 miles and 2004 on is recommended every 120,000 miles. You also want to replace the timing belt tension and idler with each belt. It has been my experience working in a dealership that sometimes the belt may start developing cracks and wear from the enviroment it is exposed to. Therefore if the belt looks to be in a less than ideal condition you may wish to consider replacing it before the mileage to be on the safe side since these are "interference" motors and a broken timing belt will cause a lot of expensive damage.