We Use CookiesWe use cookies to enhance the security, performance,
functionality and for analytical and promotional activities. By continuing to browse this site you
are agreeing to our privacy policy
10 Best Iridium Spark Plugs 2025 in the United States
From leading brands and best sellers available on the web.
Related Products
Up to 20% off
How do we rank products for you?
Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.
Most Popular Categories Right Now
FAQ
Buying Guide for the Best Iridium Spark Plugs
Choosing the right iridium spark plugs for your vehicle is crucial for ensuring optimal engine performance, fuel efficiency, and longevity. Iridium spark plugs are known for their durability and ability to provide a strong, consistent spark, which is essential for the proper combustion of fuel in your engine. When selecting iridium spark plugs, it's important to consider several key specifications to ensure you get the best fit for your vehicle and driving needs.Heat RangeThe heat range of a spark plug indicates its ability to dissipate heat from the combustion chamber. This is important because a spark plug that is too hot can cause pre-ignition and engine knocking, while one that is too cold can lead to fouling and poor performance. Heat ranges are typically numbered, with lower numbers indicating hotter plugs and higher numbers indicating colder plugs. For everyday driving, a mid-range heat plug is usually sufficient. However, if you drive in extreme conditions or have a high-performance engine, you may need a plug with a different heat range. Always refer to your vehicle's manual or consult with a professional to determine the appropriate heat range for your specific vehicle.
Electrode DesignThe electrode design of a spark plug affects the efficiency and strength of the spark it produces. Iridium spark plugs often feature a fine-wire center electrode, which requires less voltage to produce a strong spark and improves ignition efficiency. Some designs also include multiple ground electrodes or a tapered cut, which can further enhance performance. When choosing an electrode design, consider your vehicle's engine type and performance requirements. For most standard vehicles, a single fine-wire electrode is sufficient. For high-performance or modified engines, you might benefit from a more advanced design.
Gap SizeThe gap size of a spark plug is the distance between the center and ground electrodes. This gap is crucial because it affects the spark plug's ability to ignite the air-fuel mixture in the engine. A properly gapped spark plug ensures efficient combustion and optimal engine performance. Gap sizes are usually specified by the vehicle manufacturer and can vary depending on the engine design. It's important to check and adjust the gap size according to your vehicle's specifications. Using a spark plug gap tool, you can easily measure and set the correct gap. For most vehicles, the gap size is pre-set by the manufacturer, but it's always good to double-check before installation.
Thread Size and ReachThread size and reach refer to the dimensions of the spark plug that determine how it fits into the engine's cylinder head. The thread size is the diameter of the threaded portion, while the reach is the length of the threaded portion that extends into the combustion chamber. These specifications are critical because an incorrect size can lead to poor sealing, misfiring, or even engine damage. Always refer to your vehicle's manual or consult with a professional to ensure you select spark plugs with the correct thread size and reach for your engine.
Resistor or Non-ResistorSpark plugs can be either resistor or non-resistor types. Resistor spark plugs contain an internal resistor that helps reduce electromagnetic interference (EMI) and radio frequency interference (RFI), which can affect electronic components in modern vehicles. Non-resistor spark plugs do not have this feature and are typically used in older vehicles or high-performance engines where EMI and RFI are less of a concern. If you drive a modern vehicle with electronic systems, it's generally recommended to use resistor spark plugs to prevent potential interference issues. For older or specialized engines, non-resistor plugs may be suitable.