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Genuine OE BOSCH 0242140521 / ZR6SII3320 DOUBLE IRIDIUM Spark Plug Bosch Double Iridium Spark Plugs are engineered to deliver both high performance and long life, representing the best of OE spark plug technology. The ultra-fine wire design and laser welded tapered ground electrode deliver optimum performance, while the iridium center electrode and platinum ground electrode help it to go the distance. Unlock the performance in your engine with Bosch Double Iridium Spark Plugs. Double Iridium electrodes – iridium firing pin and iridium ground electrode inlay offer higher performanceOE-matched spark position for compatibility with new Gasoline Direct Injection (GDI) technology4X Longer Service Life: compared to standard copper spark plugs OE Replacement: meets or exceeds manufacturer design requirements for modern gasoline engines to provide OE fit, form and functionIf you are unsure as to whether this is the correct part for your vehicle, please don't hesitate to contact us. Alternatively please use the cross reference table above.