NGK Ruthenium HX Spark plugs - TOYOTA V6 3.5L / 4.0LNGK Ruthenium HX Spark plugs TOYOTA 3. 5L 4. 0L Each order includes a complete set of spark plugs for the selected vehicle. New, state of the art NGK Ruthenium plugs designed for engines that demand high ignitability. The Double Fine Electrode (DFE) design promotes spark energy concentration and ignites a wider range of air fuel ratios, offering improved performance in rich or lean engine conditions. 0. 4mm Ruthenium alloy fine wire center electrode
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