10 Best Iridium Spark Plugs 2025 in the United States

The NGK Set of 16 Iridium IX Spark Plugs is a solid option for owners of Chrysler, Dodge, Jeep, and Ram vehicles with 5.7 or 6.4 V8 engines. These spark plugs are renowned for their durability and performance, thanks to the iridium tip that ensures a longer lifespan and better ignition compared to conventional plugs. The heat range is well-suited for high-performance engines, providing efficient combustion and preventing fouling under various driving conditions.

The electrode design promotes superior spark and combustion, contributing to better fuel efficiency and power output. The gap size is pre-set to the optimal measurement, which simplifies installation and ensures consistent performance. Furthermore, the thread size and reach are designed to be compatible with the specified engines, ensuring a perfect fit. These spark plugs are also resistor-type, offering reduced electromagnetic interference, which is beneficial for modern vehicles with complex electronics.

However, they come at a higher price point compared to standard spark plugs, which might be a consideration for budget-conscious buyers. These iridium spark plugs are highly recommended for those seeking long-lasting performance and reliability for their V8 engines.

These NGK Iridium IX spark plugs are designed specifically for Honda Pilot models from 2009 to 2019, making them a good choice if you want a direct replacement that fits well without modifications. The iridium core is a standout feature, as it offers excellent durability and better ignition performance compared to traditional spark plugs. This means your engine can start more reliably, run smoother, and maintain fuel efficiency over time. The plugs use a nickel top material and have a precise electrode design that helps create a strong spark while resisting wear and high heat, which is crucial for maintaining engine health.

The package comes with six plugs, which is ideal for a V6 engine like the 3.5L in the Honda Pilot. The product is also resistor-type, which helps reduce electrical noise that might affect other electronic components in your car. The fact that these plugs are OEM part number compatible and vehicle-specific fit suggests that these specs match Honda’s factory recommendations, ensuring proper performance and avoiding engine damage.

These spark plugs are a solid option for Honda Pilot owners needing a dependable, long-lasting iridium spark plug replacement that supports your engine’s performance and helps avoid costly repairs caused by old or faulty plugs. Customer reviews indicate good reliability and value.

The OverstockDirect OEM Iridium Spark Plugs come in a 6-pack designed specifically for UTVs, making them a solid choice for those needing genuine replacement parts. These spark plugs feature a 14mm thread size, which is common and should fit many UTV engines well, but it's important to confirm compatibility with your exact model before purchasing. Their ceramic top and nickel core materials offer durability and decent heat resistance. The iridium electrode design generally means better durability and more efficient firing compared to standard plugs, leading to improved engine performance and longer service life.

Customer ratings are very positive with a 4.7 out of 5 stars from over 500 reviews, indicating reliability and satisfaction among buyers. Since these are OEM parts marketed for UTVs, they might not fit other vehicle types. If you’re looking for spark plugs that offer OEM quality with solid reliability for your UTV, these are a trustworthy option, but double-check your vehicle’s requirements before buying.