Tune-ups prevent maintenance on your car's engine. They are a service that includes the replacement of spark plugs, air filters and possibly a few other items and an oil change. In older cars, tune-ups are needed about every 30,000-45,000 miles. But today with most newer cars they can drive for much longer without a tune-up.
Conventional spark plugs have to be replaced every 30,000 to 50,000 miles. Platinum-tipped or Iridium spark plugs usually last for 50,000 to 120,000 miles.