Is It Necessary to Replace Spark Plugs at 20,000 Kilometers?

2 Answers
KayleeAnn
07/24/25 6:50am
Replacing spark plugs at 20,000 kilometers is not mandatory; the replacement interval depends on the material: 1. Nickel alloy spark plugs should be replaced at around 20,000 kilometers; 2. Platinum spark plugs should be replaced at around 40,000 kilometers; 3. Iridium spark plugs should be replaced at around 60,000 to 80,000 kilometers. The steps to replace spark plugs are: 1. Turn off the engine and remove the spark plug cap; 2. Unscrew the old spark plug counterclockwise; 3. Screw in the new spark plug clockwise; 4. Reattach the spark plug cap; 5. After ensuring everything is correct, start the engine for a test run. Spark plugs, commonly known as "fire mouths," work by discharging the high-voltage pulse electricity sent through the high-voltage wire, breaking down the air between the two electrodes to generate an electric spark that ignites the air-fuel mixture in the cylinder.
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EzraAnn
08/11/25 2:34am
I've been driving for almost twenty years, and spark plugs don't necessarily need to be replaced every 20,000 kilometers. The manual for my previous car recommended replacement at 40,000 kilometers, with copper ones needing earlier replacement. Just check them at 20,000 kilometers to see if there's any carbon buildup or signs of burning. If the engine misfires or the car shakes, it might be the issue. Pay attention to changes in fuel consumption; if you're often stuck in city traffic, they might age faster. I suggest getting a fault code scan at a 4S shop before rushing to spend money on new ones to avoid waste.
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