What are the most expensive spark plugs?

The most expensive spark plugs are typically those made from precious metals like Iridium and Platinum, especially high-performance or specialty spark plugs designed for advanced engines. Here are some of the most expensive types:

1. Iridium Spark Plugs (Double Iridium)

• Price Range: $15 to $30 per plug.

• Why Expensive: Made from iridium, which is one of the rarest and hardest metals on Earth. It has a high melting point (2450 °C) and excellent durability, which allows it to last up to 120,000 miles or more.

• Best For: High-performance vehicles, modern engines with distributor-less ignition systems, and engines requiring long-lasting plugs.

2. Platinum Spark Plugs (Double Platinum)

• Price Range: $10 to $25 per plug.

• Why Expensive: Platinum is durable and heat-resistant (melting point: 1770 °C). Double platinum plugs have platinum on both the center and ground electrodes, enhancing longevity and performance.

• Best For: Modern engines with electronic ignition systems.

3. Ruthenium Spark Plugs

• Price Range: $20 to $40 per plug.

• Why Expensive: Ruthenium is another rare and durable metal. Ruthenium-enhanced plugs are designed to provide superior ignition efficiency and longevity.

• Best For: High-performance engines requiring the most reliable ignition efficiency and durability.

4. Racing Spark Plugs (Iridium/Platinum Blends)

• Price Range: $30 to $60 per plug.

• Why Expensive: Designed for maximum performance, heat resistance, and durability. Often made with a blend of iridium and platinum to enhance efficiency in high-compression and turbocharged engines.

• Best For: High-performance sports cars, racing engines, and modified vehicles.

Why Are These Spark Plugs So Expensive?

• They use rare, high-quality precious metals.

• They offer superior durability, performance, and efficiency.

• They are often designed for specialized or high-performance applications.