Motorcraft SP-500 Spark Plug

24-month/Unlimited Mileage Limited Warranty ;Backed by a 24 month/Unlimited Mileage Limited Warranty, which includes parts and labor costs, and is supported nationwide by Ford and Lincoln dealers and Motorcraft Authorized Distributors (Labor may have a limit. See your retailer for a copy of the limited warranty). ;Fine-Wire Double Platinum features Platinum pad on both electrodes. Extended service intervals (on all except Nickel and Standard Copper Core plugs), Proprietary platinum pad on side wire electrode (on Platinum-Iridium and Fine-Wire Double Platinum plugs). Platinum-Iridium plugs feature Iridium-enhanced center electrode. Platinum-Iridium plugs can be used in any engine regardless of ignition system. ;High-Strength Steel High Thread spark plugs for 3-valve Triton engines redesigned: New, high-strength steel shell, Nickel-plated shell for corrosion resistance, Scavenger area allows for more carbon build-up before misfires occur, Full ground strap helps for better heat transfer within the combustion chamber, Thicker insulator for better misfire prevention. ;Spark plugs are matched to the engine for optimum engine performance. Spark plug designs include continuous improvements, Resist oxidation and arc erosion, Multi-rib insulator protects against misfire, Nickel-plated shell for corrosion resistance (on all except Standard Copper Core), High-Strength Steel High Thread, Platinum-Iridium, and Fine-Wire Double-Platinum feature 0.8 mm fine-wire design. ;The only parts recommended by Ford Motor Company for Ford, Lincoln, and Mercury vehicles.