The Differences Between Nickel, Platinum, and Iridium Spark Plugs

If the engine can be compared to the soul's core of a car, then the spark plug is undoubtedly the source of the spark within that soul. A strong, stable, and easily ignitable spark for the fuel mixture is crucial for the efficient operation of the engine. So, how often do spark plugs need to be replaced in a car? To answer this, it's essential to understand the differences between nickel vs iridium spark plugs, as the material significantly impacts their longevity and performance.

Nickel Spark Plugs: Recommended replacement every 20,000 kilometers

The nickel spark plugs have a central electrode made of nickel alloy, and the side electrode is made of nickel-copper. This type of spark plug is economical and widely used in various standard vehicles. According to design standards, the lifespan of the nickel spark plugs is typically around 20,000 kilometers.

Platinum Spark Plugs: Recommended replacement every 40,000 kilometers

The central electrode of the Platinum Spark Plugs is made of platinum, while the side electrode remains nickel-copper. The diameter of the central electrode is generally between 0.6 mm and 1.0 mm. This type of spark plug has a lifespan far exceeding that of nickel alloy, making it especially suitable for high-performance engines, ensuring long-lasting and stable operation.

Iridium Spark Plugs: Recommended replacement every 40,000 kilometers

The Iridium Spark Plugs feature a central electrode made of iridium, with the side electrode also made of nickel-copper. Since the iridium central electrode is thinner, it possesses stronger corrosion resistance, though its anti-fouling capability is slightly weaker. Therefore, its actual lifespan is also approximately 40,000 kilometers.

The replacement cycle of spark plugs is not fixed and can be influenced by factors such as engine operating environment, temperature, fuel used, and the concentration of the combustible mixture. Typically, the model and specifications of spark plugs are determined by the vehicle manufacturer during product testing, so it is not recommended to change them arbitrarily. In particular, for direct injection engines, due to their unique in-cylinder structure, the replacement cycle of spark plugs may be shortened accordingly, and it is essential to follow the manufacturer's manual for replacements.