Bosch spark plugs offer original equipment quality, trusted by many well-known manufacturers worldwide. These spark plugs feature ground electrodes with a nickel alloy and copper core for high heat conduction, ensuring your engine runs smoothly and efficiently. They come with a pre-set electrode gap, so no adjustment is necessary. For optimal performance and longevity, it's advised not to lubricate the thread and to use a torque wrench for installation. Refer to the instruction manual for guidance. If you need further information about this product, please reach out via the Amazon Customer Questions and Answers section, and our dedicated team will assist you.