10 Best Spark Plugs 2026 in the United States

The ACDelco 41-962 Professional Platinum Spark Plug offers several strong features that make it a reliable choice for car owners looking for durable spark plugs. The one-piece, fired-in suppressor seal ensures a gas-tight seal, which helps to reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures. This leads to a longer lifespan of the spark plug. The double platinum point pad on the center and ground electrode enhances durability and ensures consistent voltage demands, reducing wear on the ignition system.

Additionally, the pure copper core promotes cooler electrode temperatures which maximizes durability and resistance to fouling. These features contribute to a high-performance spark plug that is ideal for car users seeking longevity and reliability in their vehicle’s ignition system. However, it's important to note that this spark plug is specifically designed for cars, so it may not be suitable for other types of vehicles. The thread size is 14 millimeters, which is a common size, but users should ensure compatibility with their specific vehicle make and model.

The ACDelco 41-962 is a solid choice due to its robust construction and thoughtful design features.

The NGK Iridium IX spark plugs are designed specifically for Chevrolet Silverado 1500 models with 5.3L and 6.2L V8 engines from 2014 to 2024. Made with iridium, a high-quality material known for durability and excellent ignition, these plugs offer strong and efficient sparks that improve combustion. This helps the engine run smoother, reduces misfires, and can contribute to better fuel economy and lower emissions.

The corrosion-resistant electrodes help maintain the spark gap, ensuring reliable performance over time. The plugs have a 14mm thread size, which fits the specified vehicles, making installation straightforward for this particular model. NGK’s reputation and the plug’s design indicate they are engineered for optimal performance in these trucks. The plugs are resistor type, which reduces electrical interference with vehicle electronics.

Users have rated these plugs highly, indicating satisfaction with their reliability and performance. Since they are vehicle-specific, these plugs are best suited for Silverado owners and may not be the right choice for other vehicles. For those seeking spark plugs that focus on long-lasting ignition efficiency and are built by a leading brand, the NGK Iridium IX is a solid option to consider.

The NGK Set of 16 Iridium IX Spark Plugs is designed specifically for Chrysler, Dodge, Jeep, and Ram vehicles with 5.7 and 6.4 V8 engines. These plugs are made from iridium, a material known for its durability and high performance. The iridium construction provides a longer lifespan and better ignitability compared to traditional spark plugs, which is a significant benefit for those looking for reliability and efficiency.

These spark plugs also feature an appropriate heat range, ensuring optimal performance under various driving conditions and preventing pre-ignition or fouling issues. The gap size is preset, which simplifies installation as users won't need to adjust it manually. The thread size and reach are tailored to fit the specified engine models perfectly, reducing the risk of installation issues or misfitting. Additionally, these plugs come with resistors, which help in reducing electromagnetic interference that can affect vehicle electronics.

This set of spark plugs is an excellent option for owners of the specified Chrysler, Dodge, Jeep, and Ram models looking for durable and high-performing spark plugs. Potential buyers should ensure compatibility with their vehicle models before purchase.