How Often Should Standard Spark Plugs Be Replaced?
3 Answers
Standard spark plugs should be replaced every 30,000 kilometers, platinum spark plugs around 60,000 kilometers, and iridium spark plugs around 80,000 kilometers. The replacement cycle varies due to differences in car brands and the types of spark plugs used, so replacement should be based on actual conditions. Below is some relevant information about spark plugs: 1. The gap between the electrodes of a spark plug greatly affects its performance. If the gap is too small, the spark will be weak and prone to carbon buildup and leakage. If the gap is too large, the required breakdown voltage increases, making the engine harder to start and more likely to misfire at high speeds. 2. Spark plugs, commonly known as "fire mouths," mainly include standard spark plugs, insulator projection spark plugs, electrode spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs.
The replacement interval for standard spark plugs typically falls between 20,000 to 30,000 kilometers, but actual needs depend on your driving habits and vehicle condition. I've encountered many owners who replace them after about two years, especially those frequently stuck in city traffic with constant start-stop cycles – spark plugs wear out much faster in such conditions. If you notice more pronounced shaking during acceleration or difficulty with cold starts, it's likely caused by aging spark plugs leading to inefficient ignition. When my own car hit 30,000 km, fuel consumption suddenly increased by 1 liter per 100 km. A check revealed the spark plug electrodes were nearly worn flat – after replacement, both power and fuel efficiency immediately returned to normal. I recommend having mechanics inspect the electrode gap during each maintenance service; replace immediately if it exceeds 1mm. Remember to always replace the full set – mixing old and new plugs will disrupt ignition balance.
Ordinary spark plugs should generally be replaced around 20,000 kilometers, although many car owners stretch it to 30,000 kilometers, but it's really not worth saving that much. When spark plugs age, their ignition energy decreases, making the engine noticeably weaker and fuel consumption secretly creeps up. Over time, the extra fuel costs could cover several sets of new spark plugs. This is especially true for cars with modified engines or those frequently driven at high RPMs, as the high-temperature environment accelerates electrode erosion. I've seen ride-hailing drivers who cover 30,000 kilometers in just six months and must replace them. For self-inspection, check for excessive carbon buildup around the center electrode – if it's blackened, address it immediately. The cheapest nickel-alloy standard models make regular replacement far more economical than repairing consequential failures.
