If you’ve ever walked into an auto parts store and stared at $5 platinum plugs sitting right next to $12+ iridium plugs, this video is for you. I put iridium vs platinum head-to-head on the stuff that actually matters: lifespan, performance, and long-term value. I also break down the real physical difference at the tip—platinum is durable, but iridium is much harder and can be made into that needle-like electrode. That sharper point needs less voltage to fire, which means less stress on your ignition coils and a more efficient spark. Then I do the math, because “cheap” can get expensive fast. Platinum is typically around 60,000 miles, while iridium is commonly 100,000–120,000 miles (and I’ve personally seen Toyotas hit 150,000 miles and still look okay). If you keep your car more than a few years, you can easily end up buying platinum twice—plus paying labor twice. I also cover the “downgrade rule”: if your car came with iridium from the factory (most modern cars after 2015), you cannot downgrade to platinum or copper without risking misfires and check engine lights. My verdict: platinum is fine for tight budgets or if you’re selling soon, but if you want the best performance and don’t want to touch plugs for 5–7 years, iridium is 100% worth it.