Can Good Spark Plugs Really Save Fuel?
2 Answers
Replacing spark plugs can save fuel and reduce consumption. If spark plugs are damaged, it can directly cause issues like ignition system leakage, increased fuel consumption, reduced power, and most notably, difficulty in ignition, affecting the vehicle's normal operation. Severe spark plug erosion, such as scarring, damage, or melted and eroded electrodes, indicates that the spark plug is damaged and should be replaced. Spark Plug Location: Spark plugs are installed on the side or top of the engine. Early spark plugs were connected to the distributor via ignition cables, but over the past decade, most car engines have switched to direct connection between the ignition coil and the spark plug. Spark Plug Replacement Interval: Under normal maintenance conditions, spark plugs should be replaced every 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it's recommended to follow the owner's manual. Typically, platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers.
I drove my car for several years before, and after switching to more expensive spark plugs, I did notice better fuel efficiency. Originally, it was about 7 liters per 100 kilometers on the highway, but now it's down to 6.5 liters. The mechanic told me that high-quality iridium spark plugs provide more stable ignition, burn gasoline more completely, and reduce waste, which naturally saves fuel. The acceleration also feels smoother now, unlike before when the engine always felt sluggish. To be honest, the fuel-saving effect is related to the condition of the spark plugs. If the old spark plugs were already carbon-fouled, the improvement after replacement is noticeable. But if the original spark plugs were still in decent condition, the difference might not be significant. Driving habits also matter—no matter how good the spark plugs are, aggressive acceleration will still waste fuel. I think regular spark plug inspections are necessary, especially for older cars. Spending a bit more on high-quality spark plugs is a cost-effective choice in the long run—both saving fuel and protecting the engine.
