How often should the spark plugs be replaced on a Mercedes-Benz GLE400?

[DelBarrett]

The spark plugs on a Mercedes-Benz GLE400 should be replaced every 65,000 kilometers. Function of spark plugs: The purpose of spark plugs is to ignite the fuel-air mixture. During operation, the electrodes of the spark plugs consume electrical energy through spark discharge, primarily from areas where discharge is easiest. After approximately 30,000 kilometers of use, their performance gradually declines, particularly in terms of ignition efficiency. For example, if the initial combustion efficiency is rated at 9, it may decrease by 5-10% every 10,000 kilometers. This decline is followed by increased fuel consumption and carbon buildup. Eventually, the vehicle may experience sluggish acceleration, prompting a visit to the repair shop for diagnostics. Classification of spark plug types: Spark plugs are categorized into hot, medium, and cold types, and different vehicles require different spark plug models. Arabic numerals (typically the second digit) printed on the spark plug insulator indicate the "heat range" of the spark plug. A smaller number denotes a higher heat resistance temperature for the spark plug, while a larger number indicates a lower heat resistance temperature.