What makes iridium spark plugs different from standard ones?

Iridium spark plugs use a fine wire center electrode made from an iridium alloy, which is significantly harder and has a higher melting point than platinum or nickel. This allows for a more consistent and powerful spark, leading to improved performance and durability.

Are these spark plugs a direct replacement for my original plugs?

Yes, these NGK Iridium IX spark plugs (ZFR5FIX-11) are designed as a direct replacement for many vehicles that originally came with specific OE spark plugs. Always check the fitment guide to confirm compatibility with your exact vehicle.

What is the benefit of the tapered cut ground electrode?

The tapered cut on the ground electrode helps to reduce the amount of metal needed, which can improve the plug's ability to ignite the fuel mixture. This often results in easier starting, smoother idling, and a more responsive throttle.

NGK Iridium IX Spark Plugs ZFR5FIX-11 Box of 4

Name: NGK Iridium Spark Plugs Box of 4 (ZFR5FIX-11)
Brand: NGK
Price: 8.32 USD
Availability: InStock

NGK Iridium Spark Plugs Box of 4 (ZFR5FIX-11)

$8.32

In Stock

NGK Iridium IX spark plugs (ZFR5FIX-11) offer improved acceleration and fuel efficiency for a wide range of vehicles.

Key Features

Fits a wide range of vehicles including Acura, BMW, Chrysler, Dodge, Honda, Hyundai, Isuzu, Jeep, Kia, and Mazda.
Iridium fine wire center electrode offers high durability and a stable spark.
Tapered cut ground electrode aids in starting, idling, and throttle response.
Pure alumina silicate ceramic insulator provides superior strength and heat transfer.
Trivalent metal plating offers superior anti-corrosion and anti-seizing properties.
Copper core helps with heat removal from the plug.

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Product Details

NGK's ZFR5FIX-11 Iridium IX spark plugs are a solid choice for upgrading your ignition system. These plugs are built with a fine wire center electrode made from an iridium alloy, which has a very high melting point and is six times harder than platinum. This construction helps ensure a consistent spark and offers improved durability over standard nickel alloy plugs. They are designed to provide better acceleration, improved fuel efficiency, and a more stable idle.

The design includes a tapered cut ground electrode, which can help with starting and throttle response. The pure alumina silicate ceramic insulator offers good strength and heat transfer, while the trivalent metal plating on the plug body helps resist corrosion and seizing, making installation and removal easier. These plugs come in a box of four, suitable for many common 4-cylinder and 6-cylinder applications. They are a popular upgrade for drivers looking for a noticeable improvement over their original equipment spark plugs.