How many kilometers should a car's spark plugs be replaced after running?

[OAxel]

Car spark plugs have different replacement intervals depending on the material. Yttrium spark plugs should be replaced every 30,000 kilometers, platinum spark plugs every 50,000 kilometers, platinum spark plugs every 80,000 kilometers, and platinum-iridium alloy spark plugs every 100,000 kilometers. Methods to check if the spark plugs are in good condition: 1. Healthy spark plug electrodes should be light yellow; black electrodes indicate an incorrect air-fuel mixture ratio. 2. If they appear oily, it suggests the spark plug gap is misadjusted or there is excessive fuel supply, or the high-tension wire is short-circuited or broken. 3. If the deposits are black, it indicates carbon buildup on the spark plugs and bypassing.