It may never break.http://www.gates.com/brochure.cfm?brochuHow often is it necessary to change the timing belt on a car?50K is the norm for most cars, however some cars such as the Audi specify 30K. If you do not change the belt, you can trash your engine beyond repair.Most manules will tell you 60,000 but in lots of cases you can push it to 75 or 80,00060k is the limit you want to push,anytime aft