How often should Mazda 6 spark plugs be replaced?
2 Answers
Mazda 6 spark plugs should be replaced every 50,000 kilometers. Methods to determine if 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 a skirt insulator and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug has a skirt insulator that is reddish-brown, with an electrode gap between 0.8-0.9mm and no signs of electrode burning. If the spark plugs are covered with oil or deposits but 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 or that the air-fuel mixture is too rich, with oil seeping up.
I've been driving a Mazda 6 for several years and have changed the spark plugs twice myself. Generally, manufacturers recommend replacing them every 60,000 to 80,000 kilometers, as stated in my manual. Last time, I delayed until 90,000 kilometers before changing them, and the car started shaking badly, with fuel consumption soaring by over 20%. Upon inspection, it was found that the spark plug electrodes were worn, nearly affecting the ignition coils. It's advisable to adjust based on driving habits; if you frequently drive short distances in the city or accelerate aggressively, you should check them at 50,000 kilometers. Doing it yourself isn't difficult—just buy a set of specialized tools and suitable iridium spark plugs—but beginners are better off going to a repair shop to avoid damaging the threads. Delaying replacement poses significant risks, potentially leading to engine stalling, reduced power, and in severe cases, damage to the catalytic converter.
