How many kilometers should the spark plugs of Corolla Hybrid be replaced?

[DeElliot]

Corolla Hybrid spark plugs should be replaced every 100,000 kilometers. Methods to determine if spark plugs are damaged: Remove the spark plugs and observe them. Judge the condition of the spark plugs based on the following appearance colors. Normal spark plugs have a skirt and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug has a skirt that is reddish-brown, with an electrode gap between 0.8-0.9mm, and no signs of electrode burning. If the spark plugs are oily or have deposits, but the spark plugs themselves are not damaged, they can continue to be used after cleaning off the oil and deposits. If the spark plugs are severely damaged, with signs such as blistering at the top, black streaks, cracks, or melted electrodes, the cause of the damage should be identified. After troubleshooting, replace the spark plugs with new ones. Additionally, if the spark plugs appear black as if smoked, it indicates that the wrong heat range was selected for the spark plugs or that the air-fuel mixture is too rich, with oil creeping up.