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Engine & warning lightsSpark Plugs: Types, Lifespan, and Reading Engine Health From ThemCopper, platinum, or iridium — and what a plug's appearance reveals about deeper engine faults.Engine & warning lightsSpark Plugs: Iridium vs Copper — the Real Change Interval Most Shops Get WrongChanging iridium plugs at 25k miles wastes money — they last 100k. A guide to types, intervals, and fair pricing.Engine & warning lightsHow to Replace Spark Plugs Yourself: Tools, Torque and Costly MistakesSpark plug replacement step by step, plug types (copper/platinum/iridium), correct torque, and US pricing.