How often should the spark plugs of the Chevrolet Cavalier be replaced?

[StMariana]

The spark plugs of the Chevrolet Captiva should be replaced every 60,000 kilometers. Methods to determine if the spark plugs are damaged: Remove the spark plugs and observe them. The condition of the spark plugs can be judged based on the following appearance colors. Normal spark plugs have their insulator skirts and electrodes appearing gray-white, gray-yellow, or light brown. A properly functioning spark plug has its insulator skirt in a reddish-brown color, with an electrode gap between 0.8-0.9mm, and no signs of electrode burning. If the spark plugs are contaminated with oil or 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, the air-fuel mixture is too rich, or there is oil leakage.