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Genuine OE BOSCH Ignition 0242232502 / FR78X SUPER 4 Spark Plug Bosch Super 4 - the first spark plug with four ground electrodes This heavy-duty retrofit spark plug is a real "power house" for every engine. The Bosch Super 4 is the first spark plug to feature thin ground electrodes with a pointed center electrode made of a chromium-nickel alloy. It has a sheathed copper core and operates on the surface air gap principle. Innovative technology for even more efficient engines Surface air gap principle with four ground electrodes - the optimum spark gap is always selected. Ground electrodes wear is evenly distributed over all four electrodes. The silver-plated center electrode ensures good heat dissipation and thus avoids the risk of autoignition due to overheating. Spark plug efficiency is enhanced by the up to 40% increase in ignition energy.If 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.