For a customer to request reimbursement for a “qualifying customer-pay repair” performed either by an authorized BMW center or independent repair shop located in the United States (including Puerto Rico), please have him/her submit his/her reimbursement request “online” at www.BMW-RP.com . 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. 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 ...

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.I don't believe I should see any oil or carbon on the spark plug crush washer or head spark plug mating surface. This would seem to indicate that the plug washers are not sealed, correct? For the above-referenced vehicles, BMW of North America, LLC (“BMW NA”) is extending the limited warranty for the fuel injectors to:

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 RangesNone of this information applies to the OEM Bosch 3-prong spark plugs. These should not be gapped. Once you reach the need to gap spark plugs you should be running 1-step or 2-step colder single prong plugs, anyways. These include the N55 OEM Bosch plugs and NGK 1 & 2-Step colder. Why Gap Spark Plugs? I have a set of fresh NGK 97506 (aka BMW N20 -SILZKBR8D8S) plugs. They are very different. Aside from the 97506 being one step colder than the NGK 95770 (5992 if you think in old numbers), there are several differences, shown in the photos below:

This precision tool is critical to properly and accurately gapping spark plugs. With this tool, you will be able to gap plugs faster and maintain accuracy. Available in 14mm and 12mm plug thread sizes. Made in the USA. Anyways, as with the other topics there are some general rules here. N54 spark plug replacement intervals are roughly:Please debate, disagree, call me stupid ... ... I'd like the possibility of getting a bit smarter on all of this. And I'd like my timing corrections to drop - I'm pretty sure my setup is at fault. I should be in the 475 – 500 WHP range so I am just curious if you would recommend deviating from the recommendations above considering the WMI setup.

These plugs are suggested for most turbo BMW motors including the N20, N54, N55, S55, N63, N63TU, S63, and S63TU applications. Note BMW B58 uses a different NGK part found here. Moving over to a 1-step colder NGK spark plug did seem to help clean up timing and misfires became less common. Exact results can vary from car to car. Still, the OEM plugs can start becoming more problematic too far beyond 400whp. If you’re around that number and aren’t having issues then there isn’t much reason to change things. Plug gap is relative to your ignition system. A tune is not going to be relevant to plug gap. If you're running iridium plugs DO NOT gap them, you'll break the electrode. If squashing your plug gap (below factory recommendations) improves your drivability then you have a failure in your ignition system and may want to look at new coils. 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. Even then it’s best to run the factory gaps and adjust as necessary if you start noticing misfires or other issues. Some people instantly recommend gapping down to 0.022″, 0.020″ or 0.018″. We think it’s too aggressive for most, but there are some general guidelines. Here’s a rough breakdown:

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When installing the plugs with Precision Raceworks coils on the N55 engine, we recommend setting the gap down to 0.022" All spark plugs remove some heat from the plug tip and transfer that heat to the engine cylinder head. Colder spark plugs are faster and more efficient at transferring heat away from the spark plug tip. Basically when you hear cold plug it means the spark plug transfers heat away from the tip rapidly. Hot plugs are slower at transferring the heat, which means the firing tip remains hotter. 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.