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NGK Laser Iridium Spark Plug | ILZFR6D11

BMW X5, 325i, 328i, X3, 530i, 528i, 330i, 525i, Z4, 328i xDrive & more
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P/N: ILZFR6D11 NGK Laser Iridium OEM
Original BMW laser iridium version. 6 per car.
Cross References:
  • 1208
  • 12120032137
  • 12120035915
  • 12122158253
  • W01331717546
Part Details:
  • Original equipment NGK laser iridium spark replacement for BMW part number 12122158253
  • This spark plug is used to ignite air/fuel mixture in cylinders for combustion in BMW N52, N54, and N55 L6 engines
  • (6) per vehicle
  • Replaces fouled spark plugs that are not igniting air/fuel mixture in the engine for combustion
  • Recommended to be replaced when replacing ignition coils
  • Recommended to be replaced every 90,000 miles
  • Fits BMW 128i 2008-11/2009, 325i 2006, 325xi 2006, 328i 2009-11/2009, 328i xDrive 2009-11/2009, 328xi 2007-2008, 330i 2006, 330xi 2006, 525i 2006-2007, 525xi 2006-2007, 528i 2008-11/2009, 528i xDrive 2009-11/2009, 530xi 2008, 530i 2006-2007, 530xi 2006-2007, X3 2007-11/2009, X5 3.0si 2007-2008, X5 xDrive30i 2009-11/2009, Z4 3.0i 2006-2008, Z4 3.0si 2006-2008, and Z4 sDrive30i 2009-11/2009
  • NGK is one of the world’s largest manufacturers of high quality reliable original equipment spark plugs for automotive, marine, motorcycle, and applications.

Spark plugs provide the spark needed to ignite the air/fuel mixture in each cylinder for engine combustion. High voltage from the ignition coil is transferred through the spark plug to an air gap between the spark plug tip and the spark plug ground to the engine. Once the voltage reaches the air gap, the voltage jumps the gap in the form of a spark, igniting a compressed air fuel charge inside the cylinder. The air fuel charge explodes, creating the force needed to push the cylinder down and turning the engine crankshaft to propel the engine. In short, spark plugs serve a vital function in keeping your BMW running properly.

Components of a Spark Plug
  • A metal terminal that connects to the ignition system
  • A center electrode for current to flow through the spark plug with a tip for the current to jump making the spark
  • A ribbed ceramic insulator to keep current flowing through the spark plug center electrode and not into other parts of the engine
  • A threaded metal case to anchor the spark plug into the cylinder head with a ground electrode for the spark to jump to
  • A seal to seal the spark plug case to the cylinder head to prevent cylinder compression from escaping
Types of Spark Plugs

The biggest differences in spark plug construction are the materials used for the electrodes, their conductivity, and their wearability.

  • Copper is the base material for the center electrode on most spark plugs as it provides superb conductivity. These tend to wear quickly from the electrical transfer created by the spark and fully copper spark plugs need to be replaced every 15,000 miles.
  • Copper core spark plugs with yttrium or nickel tipped electrodes and grounds take longer to wear and can last up to 30,000 miles.
  • Platinum tipped copper core electrodes wear even less, provide superior conductivity, and can last up to 60,000 miles.
  • Iridium tipped copper core spark plugs wear the least and can last over 100,000 miles.

When a spark plug fails prematurely it will provide a weak spark or no spark at all. Causes of premature spark plug failure can include oil leaking from the valve cover into the spark plug chamber, your engine running too lean and overheating the spark plug, and your engine running too rich and fuel fouling the plug.

Most engines are designed to run on only one type of spark plug based on its use. Be sure to check your owner’s manual for the right type of spark plug needed for your BMW.

View more BMW Spark Plugs.

Left = Driver side and Right = Passenger side.
All parts are priced individually unless identified as a set or kit. "Per car" notes identify how many of a given part your car has and "Left/Right or Front/Rear" notes means the part fits the left or right side of the car. These parts are still sold individually and you'll need to select the appropriate quantity if you plan to replace more than one of this item.

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What This NGK Laser Iridium Spark Plug Fits?

Application information below is for reference only and should not be used to determine the exact vehicle fitment. Please use the "Make Sure It Fits" vehicle selection box above to determine the exact fitment and review any application notes. If you need any help determining if this part works with your vehicle, please don't hesitate to contact us.

08-12 - 128i
09-10 - 128i
thru 11/09
06-08 - 323i E9X
06-06 - 325Ci E46
06-06 - 325i E9X
06-06 - 325xi E9X
07-11 - 328i
09-10 - 328i
thru 11/09
10-11 - 328i xDrive
09-10 - 328i xDrive
thru 11/09
07-08 - 328xi
06-06 - 330i E9X
06-06 - 330xi E9X
06-07 - 525i
05-05 - 525i
For models with N52 engine code only.
06-07 - 525xi
08-11 - 528i
09-09 - 528i
thru 11/09
10-10 - 528i xDrive