47% of Drivers Overpay: Why Iridium Spark Plugs Are a Waste for Most Cars—and a Goldmine for the Right Few
1. Category Definition & Scope The spark plug category for gasoline internal combustion engines spans a performance and durability continuum defined by the electrode material. This report covers the premium segment: iridium and platinum spark plugs, used in passenger cars, light trucks, and SUVs. It excludes copper/nickel standard plugs (entry-level, short lifespan) and diesel glow…