What type of spark plugs does the BMW 5 Series use?
3 Answers
BMW 5 Series uses spark plugs with the model number ILZKBR7B8DG, which are NGK spark plugs. Spark plug replacement interval: Under normal maintenance conditions, they should be replaced after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it is recommended to follow the user manual. You can refer to the following standards for maintenance replacement: platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000-80,000 kilometers. How spark plugs work: Under high voltage, the air between the center electrode and the side electrode of the spark plug rapidly ionizes, forming positively charged ions and negatively charged free electrons. When the voltage between the electrodes reaches a certain level, the number of ions and electrons in the gas increases like an avalanche, causing the air to lose its insulating properties and forming a discharge channel, resulting in a "breakdown" phenomenon. At this point, the gas forms a luminous body, known as a "spark." Along with the heat expansion, a "crackling" sound is also produced. The temperature of this electric spark can reach as high as 2,000-3,000°C, which is sufficient to ignite the air-fuel mixture in the engine cylinder.
When driving my BMW 5 Series for daily commuting, I've paid special attention to the spark plug issue. The BMW 5 Series generally recommends using high-quality spark plugs, such as those from Bosch or NGK, depending on the engine model—if you have a four-cylinder engine, you might use an iridium model like the Bosch FR8DPP332X, while a six-cylinder would require NGK SILZKGR8B8S platinum plugs. The last time I replaced a set myself, I noticed that worn-out spark plugs significantly affect startup, causing the car to shake and accelerate unevenly, and in severe cases, they can even lead to engine failure. Don’t skimp on spark plugs—BMW engines are highly precise, and using the correct model is crucial to avoid increased fuel consumption. I recommend checking them every 20,000 to 30,000 kilometers, and when replacing, it’s best to visit a professional shop since they’re tucked deep in the engine and tricky to access. During daily driving, pay attention to the engine sound; if you hear unusual noises or experience rough idling, addressing it promptly can save you a lot of money.
With over thirty years of driving experience, I've handled various BMW models, including multiple generations of the 5 Series. Spark plugs, though small, are crucial for vehicle performance. BMW 5 Series typically comes equipped with premium spark plugs from Bosch or NGK, such as iridium electrode models known for their long lifespan and strong ignition. However, the specific type depends on the model year and engine: for instance, pre-2015 models often use copper-core spark plugs, while newer versions have upgraded to platinum or iridium. I once experienced loose spark plugs that caused severe shaking during acceleration, nearly leading to a breakdown. I recommend replacing them every 40,000 kilometers or so—don't wait until they fail. When changing spark plugs, ensure the heat gap matches the factory specifications; otherwise, it could affect combustion efficiency or even damage the ignition coil. During routine maintenance, have your technician check the voltage to ensure the ignition system runs smoothly.
