How long do iridium spark plugs last? It depends on the type of plugs you buy. Standard iridium plugs have an iridium-coated positive electrode, while the negative electrode uses a standard nickel coating. These plugs last around 60,000 miles. Premium plugs, also called double iridium plugs, use an iridium on both electrodes. These plugs last up to 100,000 miles. While most iridium plugs sold today use premium electrodes, be sure to double check the manufacturer’s specifications.
