Seller notes

Description A Set of four Brand New Denso Original U-Groove Spark Plugs U-Groove The U-Groove is Engineered for Greater Fuel Efficiency and Improved Throttle Response DENSO's patented U-Groove spark plug enables complete combustion by allowing the spark to fill the gap created by the U shape. The ball of fire created in the U-Groove develops a larger and hotter flash front that virtually eliminates excessive fouling and erratic starts caused by poor fuel mixtures. Even DENSO's "standard" spark p...

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