What Causes Oil in Car Spark Plugs?

[NathanLynn]

Car spark plugs getting oiled can be caused by: The air-fuel mixture being too rich, which blocks the gap of the spark plug, resulting in the spark plug failing to produce a spark, essentially being flooded with gasoline. Since there are many factors that can lead to spark plug flooding, if you notice signs of cylinder flooding, it's best to have it checked at a professional repair shop. If you need to replace spark plugs, make sure to choose ones with the correct heat range for your vehicle model. Otherwise, it could easily affect the engine's performance, and in severe cases, the spark plugs might even get completely damaged. The role of a spark plug is to conduct high voltage electricity from the ignition coil into the engine cylinder, creating a spark across the electrode gap to ignite the air-fuel mixture.