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The patented DENSO Standard U-Groove Spark Plug enables complete fuel ignition in the combustion chamber 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 erratic starts caused by poor fuel mixtures and excessive fouling. While manufacturers recommend replacing spark plugs every 30,000 to 50,000 miles, every vehicle is different. Indeed, if your vehicle is already exhibiting bad spark plug symptoms including slow acceleration, poor fuel economy, or engine misfires, you may need a car spark plug replacement sooner rather than later. Trust in DENSO, a leading supplier to OE automakers around the world, to provide premium spark plugs that showcase unmatched performance, reliability, and fitment.