How Often Should Nickel Alloy Spark Plugs Be Replaced?

[VanLawson]

Nickel alloy spark plugs are typically used in naturally aspirated engine models, and manufacturers generally recommend replacement every 15,000 to 20,000 kilometers. Here is a detailed guide on assessing spark plug condition based on color: Tan, gray: If the insulator appears tan, brown, or grayish-white with minimal electrode wear, the spark plug can continue to be used for an extended period. Black: If covered with black carbon deposits (severe cases may cause engine stalling), these indicate carbon buildup. Significant carbon accumulation suggests the owner should consider replacing the spark plug. Black, moist, and shiny oil stains: The presence of black, moist, and shiny oil stains indicates oil contamination on the spark plug surface. Owners can clean this themselves. Excessive oil contamination can make the car difficult to start, and the underlying cause of the oil contamination should be thoroughly investigated. White scorching: If the insulator skirt appears white and scorched with burned electrodes, the owner should replace the spark plug immediately. Continued use may lead to further issues due to spark plug damage.