How Often Should I Replace My Spark Plugs?

Unless your car is hard to start, idles roughly, accelerates sluggishly or gulps gasoline, you’ll probably get little benefit from replacing the spark plugs before the time or mileage interval recommended by the vehicle manufacturer. Some manufacturers recommend replacing spark plugs as soon as 60,000 miles, while others say 100,000 miles or later. Spark plugs use precious metals, such as platinum and iridium, that extend their useful lives, and computer controls on today’s cars help keep the plugs in like-new condition for years.