Description
The NGK SILZKGR8B8S (Stock #94201) is a premium Laser Iridium spark plug engineered for modern high-efficiency engines. Designed as an OE (original equipment) plug, it combines an iridium fine-wire center electrode with a platinum ground electrode (SPE design) for exceptional ignitability, durability, and long service life.
This plug is commonly used in BMW and Mini turbocharged engines, where precise ignition and extended service intervals are critical.
Key Features
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Laser Iridium technology – superior performance and longevity
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Fine-wire iridium center electrode – ultra-high durability (6x harder than platinum)
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Square Platinum Electrode (SPE) – improved ignitability and even wear
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Extended metal shell design – optimized for modern engine combustion chambers
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Copper core – excellent heat dissipation and conductivity
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Trivalent plating – corrosion and anti-seize protection
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OE-specific design – built for exact engine requirements
Specifications
General
- Part Number: SILZKGR8B8S
- Stock Number: 94201
- Plug Type: Laser Iridium (Performance)
- Heat Range: 8
- Resistor: Yes (5000 Ohms)
- Gap: 0.75 mm
Shell / Dimensions
- Thread Size: M12 - 1.25
- Reach: 26.5 mm
- Hex Size: 14 mm Bi-Hex
- Seat Type: Flat
- Washer Included: Yes
- Skirt: Yes (Extended Metal Shell)
Electrodes
- Center Electrode: Iridium Fine Wire
- Ground Electrode: Platinum (SPE – Square Platinum Electrode)
- Ground Configuration: J-Gap
- Projection: Long Projection
Other
- Terminal Type: Cup
- Insulator Material: Ceramic
- Insulator Height: 51.0 mm
- Grade Type: Performance / OE Replacement
Fitment Highlights
Primarily used in modern BMW and Mini turbocharged engines, including:
BMW
- 2 Series: 230i / M240i (2017–2021)
- 3 Series: 330i / 340i (2016–2019)
- 4 Series: 430i / 440i (2017–2020)
- 5 Series: 530i / 540i / 530e (2017–2020)
- 7 Series: 740i / 740e / 740Le (2016–2019)
- X Series: X1, X2, X3, X4 (2016–2019)
Mini
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Cooper / Clubman / Countryman (2014–2020, 1.5L & 2.0L engines)
Performance Notes
- Designed for turbocharged, high-compression engines
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Long projection + extended shell improves combustion efficiency
- Provides better fuel efficiency, smoother idle, and improved throttle response
- Typically supports long service intervals (often 60k–100k miles depending on OEM spec)
- Should not be substituted with standard nickel plugs in these applications
Summary
The NGK SILZKGR8B8S (94201) is a high-end OE Laser Iridium spark plug featuring a long-reach extended shell, fine-wire iridium center electrode, and platinum ground electrode. It’s specifically engineered for modern BMW and Mini engines, delivering maximum ignitability, durability, and performance.
