How to Choose the Right Spark Plug?
2 Answers
When purchasing spark plugs, try to ensure that the new spark plugs match the size and model of the original ones, preferably using original equipment manufacturer (OEM) parts. The size of the spark plug is usually printed on the ceramic insulator of the skirt. Even if you can't understand it, just make sure the numbers and letters on the new and old spark plugs are identical. Steps for replacing spark plugs: Open the hood, lift the plastic cover of the engine, and remove the high-voltage distributor wires. Mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris like leaves or dust and ensure everything is cleaned thoroughly. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the high-voltage distributor wires in the firing order, and finally, secure the cover plate.
I believe choosing spark plugs should start with material and heat range. As someone who has driven for twenty years, I always refer to the vehicle manual first to find the manufacturer's recommendations. Materials are divided into several types: copper plugs are cheap but have a short lifespan, suitable for older cars; platinum plugs are more durable and ideal for family cars; iridium plugs offer the highest ignition efficiency, perfect for high-performance engines or those seeking fuel efficiency. Heat range is crucial—cold plugs prevent overheating in high-speed vehicles, while hot plugs avoid carbon buildup in low-speed commuting. I recommend selecting based on driving habits, such as choosing platinum plugs with a moderate heat range for city traffic jams. Replacement intervals typically range from 30,000 to 100,000 kilometers—worn-out plugs can cause engine misfires or increased fuel consumption. Don’t forget to check the electrode gap, usually 0.7-1.0mm; a simple gap gauge inspection can prevent installation issues.
