How many miles do you drive before changing your timing belt on a 2003 Isuzu axiom?

80k The above answer is incorrect. The belt requires changing at 100,000 miles under normal conditions. If you drive in severe conditions, then change it at 75,000 miles. Warning: This engine is an Interferance Engine and as such if the belt breaks serious engine damage will occur. Also the water pump is driven by the same belt. To save on future labor costs, replace the water pump at the same time you replace the belt. Considering the average driver is in severe conditions 90% of the time, I wouldn't say incorrect. Just a safe median.