Toyota Genuine Parts 90080-91180 Spark Plug Genuine OEM Toyota Spark Plugs All resistor plugs with single ground electrodes feature patented U-goove design, resulting in a hotter spark Platinum-tipped plugs are designed to last up to 60,000 miles before replacement Toyota adds nickel and iridium to the platinum; this alloy helps make the spark plug strong and durable, while helping to prevent cracking Genuine Toyota iridium spark plugs: The long-life, high-performance spark plugs