Question: are iridium spark plugs worth it?
Answer: It is estimated that iridium spark plugs will last for at least 60,000 miles. However, they've been known to go up to 80,000 miles, or even 120,000 miles, depending on the vehicle. ... So, an investment in these spark plugs would surely be worth it for this. You may never actually have these spark plugs go bad on you.