All resistor plugs with single ground electrodes feature a patented *U-groove design*, resulting in a hotter spark. All *platinum-tipped plugs* are designed to last up to 60,000 miles before Replacement. For newer Toyota vehicles with distributor less Ignition systems (DIS), replace your original spark plugs with the same *dual ground electrode* platinum-tipped plugs that Came standard with the vehicle ? single ground electrode plugs offered by competitors will only last one-half as long.