When used on the N54 these plugs must be gapped precisely to 0.020" (0.508mm) using a spark plug gap tool! Also on N54 these plugs will need replacing much sooner than OEM plugs. For FBO N54 applications, we recommend first using the NGK ILZKBR7B8DG plugs first (1 step colder). This colder plug should only be used on very highly modified N54 engines, such as with upgraded turbos or water/meth injection. It's 2 steps colder on the heat range, which lowers combustion chamber temperatures and reduces misfires and knocking (pre-detonation). This plug can be used in N54 engines as an upgrade. While BMW may recommend "lifetime" 100,000 mile replacement intervals, we generally recommend 50-60,000 mile replacements. Spark plugs wear out over a long time, making losses in performance less obvious. And on double platinum/single platinum/iridium I will visually check gap to see if the box has been dropped. For any brand copper plug I will check gap. Fortunately I dont buy those plugs because I dont own a VW/Audi. Unburnt fuel in the exhaust will shorten the lifespan of oxygen sensors and catalytic converters. For Bosch fancy crab spark plugs that cant be gapped I dont do anything. A bad plug(s) will harm performance and fuel mileage and affect drivability and engine smoothness. Iridium composition provides a high melting point and great strength, and provides excellent wear resistance and. They are our latest in spark plug technology and an exact replacement for your vehicle’s original components. Just like ignition coils, spark plugs are key to the performance and efficiency of your BMW engine. ACDelco Professional Iridium Spark Plugs are the high quality replacement ideal for many vehicles on the road today. It's the best all-around plug you can buy. ![]() Fortunately I don't buy those plugs because I don't own a VW/Audi. Although the NGK factory will set the gap to a pre-selected setting, this may not be the right gap for your particular engine. A spark plug part number might fit hundreds of different engines from many different manufacturers. The OEM plugs meet the design requirements set by BMW for a wide range of operating conditions and fuel mixtures. For Bosch fancy crab spark plugs that can't be gapped I don't do anything. NGK Spark Plugs USA FAQs - Spark Plugs Q: Do I need to set the 'gap' when installing a new set of plugs A: Maybe. Having the correct plugs in your car ensures optimal performance and efficiency from your engine. While plugs are pre-gapped from the factory, the gap may need to be adjusted for the vehicle that the spark plug is intended for. NGK is an original supplier to BMW for spark plugs and other ignition components and this plug meets all of the original specs. It's also used as an upgrade in highly modified N54 engines. ![]() This is the OEM NGK spark plug used in the N20 and N26 turbocharged four-cylinder engines.
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