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How often should spark plugs be changed?

How often should I change my spark plugs? It depends on the electrodes used on your plugs. Copper plugs typically last 20,000 miles. Platinum and budget iridium plugs last around 60,000 miles. Double platinum and premium iridium plugs can last 100,000 miles or more.
It also depends on your driving conditions. If you put heavy stress on your engine, whether that means heavy towing, city driving or racing, your plug’s lifespan could be much shorter. You might notice reduced power when the plug has less than 25% of its life left due to worn electrodes. At this point, it may be worth replacing them to improve your car’s performance.

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