Have a new belt installed if your vehicle's mileage is close to the recommended replacement interval in the owners manual. (articles.orlandosentinel.com)
2nd replacement interval is 6 years / 75,000 miles (120,000 km) after the 1st. (mechanics.stackexchange.com)
Open your owner's manual to see for yourself and you might discover that you drive a car with 100,000 - mile spark plug replacement intervals. (humblemechanic.com)