Laser Iridium spark plugs provide superior ignitability and long service life. The smallest tip diameter available ensures slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions. The factory N55 spark plugs are the Bosch ZR-5-TPP-33 and are a decent option for the N54 too. They’re actually 1-step colder than the N54 spark plugs, so they can help support some extra power. We prefer moving to an iridium spark plug – like the NGK options – at roughly 450-500+whp levels. Even below that we would still opt for the NGK 97968 1-step colder N54 plugs. The bottom of all the spark plugs all have some oil residue and carbon by the crush washer ring. Varying amounts up the threads. It took a wire brush to clean them up, including the crush washer face.

Which spark plug is right for each person, engine, mods, tuning, etc can vary a lot. That’s why we put some larger and overlapping power levels above. It’s not like all OEM spark plugs are going to start having endless issues right at 375-400whp. Likewise, 2-step colder spark plugs are probably OK even at 400whp. I'm going to try to be as brief as possible but there are several related things I wish to bring up relative to plugs. I've done reading on Spoolstreet as well as other forum threads, with some success, but nonetheless ... The ceramic insulation for the ground electrode on the 97506 is 5mm wide inside the steel shaft, versus 3.8mm for the 95770. Below we’ll list a few of the best spark plugs for the BMW N54 engine. Many of these are highly proven spark plugs. However, there are other good options that people have success with. As such, this isn’t an exhaustive list of all plugs for the N54 engine. These are simply products we recommend based on personal experience running these on our 2007 335i, 2008 135i, and 2008 535i. There’s overlap in these numbers for good reason. Boost pressures, fuel type, and other factors can affect these numbers. Some N54 engines may be happy with a 0.022″ gap even at 700whp. Others may need a 0.018″ gap before 600whp. The above guidelines are a good starting point, though.

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For the above-referenced vehicles, BMW of North America, LLC (“BMW NA”) is extending the limited warranty for the fuel injectors to: This bulletin is notice of a “limited warranty extension.” This is NOT a notice of a Recall or Service Action.

Often specified as original equipment, NGK Laser Iridium spark plugs are the best combination of performance and longevity. Gapping spark plugs is another common topic for good reason. It’s important to have a good spark plug gap for many reasons. Too large a gap can cause misfire issues while too small a gap can reduce air-fuel burn efficiency. So, what is the right gap for N54 spark plugs? Let’s jump in and discuss the importance of spark plug gaps and recommendations for the 135i, 335i, and 535i. While colder options may exist the 1-step and 2-step colder spark plugs are the most common choice on the N54. Among the two most popular are the NGK 97968 1-step colder and NGK 97506 2-step colder. These are generally good options even for 600-700+whp builds, which is why we don’t fully agree with the 75-100 horsepower rule.Discussing spark plugs for the BMW N54 engine can be a lengthy topic. While spark plugs are a pretty simple part they’re extremely important, and there’s a lot that goes into the right setup. How often should you change spark plugs? What are colder plugs and when are they needed? What are the best spark plugs and gaps? None of these question have perfect answers, but there are some general guidelines. In this guide, we discuss some of the best N54 spark plugs, 1-step & 2-step colder, plug gapping, replacement intervals, and more. Pin Spark Plug Heat Ranges Colder spark plugs help move heat away from the firing tip and into the engine head. As boost increases there’s more combustion heat, so it necessitates a colder spark plug. We like moving to NGK 1-step colder spark plugs above the 350-400whp ballpark and up to ~450-550whp. Above that power you should consider moving to NGK N54 2-step colder plugs. NGK is the brand leader in the UK spark plug market and are the world’s biggest supplier to many major car manufacturers. Each and every one of their products are designed to meet the most rigorous standards and are the professionals’ choice because of their quality and technical excellence. Their plugs can be found in use by teams in F1, WRC and MotoGP. Put simply, NGK genuine spark plugs are the workhorse at the heart of smooth-running engines around the world. FFS you seriously need to do maybe 10 minutes of research before speaking on a subject. You continue to prove over and over again your "20 years" of experience is about as useful as zero years of experience.