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NGK Laser Iridium Resistor Spark Plug; SILZKFR8E7S | 0041597003

Mercedes C300, Sprinter 2500 RWD, CLA250, GLC300, Sprinter 2500 4WD, GLA250, E300, Metris, SLK300, GLC350e & more
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P/N: 0041597003 NGK Laser Iridium Resistor OEM
4 per car.
Cross References:
  • 0041597903
  • 2701590700
  • 7434
  • 90654
  • 92725
  • V6SII3328
Part Details:
  • Original equipment NGK SILZKFR8E7S (90654) Laser Iridium electrode replacement spark plug
  • This spark plug is used to ignite the air/fuel mixture in the cylinders for combustion in Mercedes M270 and M274 L4 engines
  • (4) per engine
  • Replaces fouled spark plugs that are not igniting the air/fuel mixture in the engine for combustion
  • It is recommended to replace the spark plugs when replacing the ignition coils
  • Recommended to be replaced every 90,000 miles
  • Fits Mercedes C300 2015-2018, C350e 2016-2018, CLA250 2014-2019, E300 2017-2019, GLA250 2015-2020, GLC300 2016-2019, GLC350e 2018-2020, Metris 2016-2022, SLC300 2017-2016, Sprinter 1500 2019-2023, and Sprinter 2500 2019-2022
  • 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 Mercedes 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 Mercedes.

View more Mercedes 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 Resistor 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.

15-18 - C300 Base, 4Matic
16-18 - C350e
14-19 - CLA250 Base, 4Matic
17-19 - E300 Base, 4Matic
15-20 - GLA250 Base, 4Matic
16-19 - GLC300 Base, 4Matic
18-20 - GLC350e 4Matic
16-20 - Metris
17-20 - SLC300 Base, Final Edition
16-16 - SLK300
19-20 - Sprinter 1500
19-20 - Sprinter 2500 4WD
19-20 - Sprinter 2500 RWD