When should you change the timing belt on 2003 Chevrolet Impala?

According to the maintenance schedule provided in the 2003 Chevrolet Impala owner's manual, the timing belt should be replaced every 60,000 miles (or 96,560 kilometers) under normal operating conditions. However, if your Impala is subjected to severe driving conditions, such as frequent towing, hauling, or off-road use, the timing belt should be replaced every 45,000 miles (or 72,420 kilometers).