* Belt Quality: A higher-quality belt will generally last longer.
* Environmental Conditions: Extreme heat or cold can degrade a belt faster.
* Maintenance: Regular inspections for cracks, fraying, or glazing are crucial.
* Proper Tension: A belt that's too tight or too loose will wear out prematurely.
* Idler Pulley and Tensioner Condition: Worn pulleys can cause premature belt wear.
While some might get 60,000 miles or even more from a serpentine belt, a more realistic expectation is between 50,000 and 80,000 miles. However, it's always best to inspect the belt regularly (visually checking for cracks and wear is easy) and replace it if necessary, rather than waiting for it to fail. A broken belt can cause serious engine damage. Many mechanics recommend replacing it during a major service interval, even if it looks fine.
