Let's say you've just removed an old spark plug. Does it have any life left in it? Can it be reused if it is cleaned properly ...

Iridium plugs: $20 to $100 each; Labor charges vary depending on the complexity of each engine, with V6 and V8 engines costing more than four-cylinder engines. The average labor cost ranges between ...

Starting in the mid-1990s, iridium-tipped plugs appeared. Iridium is even harder than platinum, so these plugs were intended to last longer. They are also claimed to slightly increase combustion ...

When it's time for a replacement, upgrading to iridium spark plugs can offer better overall engine performance and efficiency. ... Unless you've got old, worn-out plugs or your engine, ...

Why it made the cut: Replace old, worn plugs with these high-efficiency iridium ones by Autolite. Vehicles are made up of a wide variety of parts that work together to make the car or truck function.

Fine-wire spark plugs are designed with thinner electrodes, often made of precious metals such as platinum or Iridium, to provide superior performance and longevity.

Some mechanics have even reported engines running iridium plugs past 150,000 miles without issue, though most still recommend checking around the 80,000 to 100,000 miles just to be safe.

Let's say you've just removed an old spark plug. Does it have any life left in it? Can it be reused if it is cleaned properly? Let's take a closer look.