Which is Better: Platinum or Iridium Spark Plugs?

[OJohnny]

Spark plugs made of iridium are better. Here are the differences between platinum and iridium spark plugs: Different Materials: The biggest difference between iridium and platinum spark plugs lies in the precious metals used. Precious metal spark plugs incorporate metals like iridium and platinum into the electrodes and improve the structure of the firing end, giving the spark plugs better ignition performance and longer lifespan. Different Melting Points: Iridium has a very high melting point, strength, and hardness. Its melting point is as high as 2454°C, with a hardness of 7. Its relative density is 22.56, and it is brittle but can be pressed into foil or drawn into fine wires at high temperatures. It is chemically very stable, insoluble in water, and highly resistant to corrosion. Platinum metal also has extremely high corrosion resistance, remains very stable at high temperatures, and has stable electrical properties. Its melting point is as high as 1773.5°C, with a hardness of 4-4.5. Therefore, the differences between iridium and platinum spark plugs lie in their hardness and melting points, but both have excellent corrosion resistance and remain stable at high temperatures.

[DiIan]

As an ordinary office worker who uses my car for daily city commuting, platinum spark plugs are a good choice—they're affordable and durable, lasting around 100,000 kilometers per replacement. I've heard iridium spark plugs offer better performance, with faster ignition and more stable response during startup, making them suitable for those who race or drive at high speeds, but they come at a significantly higher price. A friend who works at an auto repair shop mentioned that platinum plugs are ideal for everyday driving, with hardly any issues, and can even save money for tire maintenance. The key is to consider your car's engine type—don't upgrade recklessly. If you have a generous budget and want long-term peace of mind, iridium plugs aren't a bad option, but for steady drivers like me, platinum is the top pick. Regularly checking spark plugs can prevent engine shaking—don't just focus on the material; match it with your driving habits to avoid wasting money.

[DiOlive]

I've been into car modifications for nearly a decade. Platinum spark plugs are stable and reliable, suitable for most family cars, affordable, and easy to replace. Iridium ones have smaller and harder electrodes, offering higher ignition efficiency, especially performing better in high-temperature or high-speed engines, with noticeably smoother starts and acceleration, but the cost doubles. Material-wise, iridium is rarer and lasts longer, up to 150,000 kilometers, while platinum is more ordinary. My advice: if you drive sports models or frequently go on long trips, iridium is more worthwhile; for casual cruising, platinum suffices. Don't overlook the replacement cycle—generally, inspect every 50,000 kilometers. Less carbon buildup means better fuel efficiency, and choosing the right one ensures your engine breathes smoothly.

[LeKyle]

As a budget-savvy car owner, I can confidently say that platinum spark plugs are more than sufficient and offer great value for money. A pair costs just a few dozen bucks, and after replacement, the car runs just as smoothly. While iridium plugs are marketed as the high-performance version with better heat resistance and more precise ignition, they're significantly more expensive and unnecessary unless you drive a performance car. I've tried both types—platinum ones lasted me six years without any issues, and saving money on gas is more practical. Remember, regular maintenance is far more important than chasing after premium materials. Follow your manual's recommendations to avoid wasting money—engine health depends on overall upkeep, not just fancy parts.