Vehicle Fitment

• 2013–2014 Mercedes-Benz C300 (W204, 3.5L V6, RWD/4MATIC)
• 2012–2014 Mercedes-Benz C350 (W204, 3.5L V6, RWD/4MATIC)
• 2015 Mercedes-Benz C400 (W205, 3.0L V6 Turbo, 4MATIC)
• 2016 Mercedes-Benz C450 AMG (W205, 3.0L V6 Turbo, 4MATIC)
• 2017–2023 Mercedes-Benz C43 AMG (W205, 3.0L V6 Turbo, 4MATIC)
• 2014–2016 Mercedes-Benz E300 (W212, 3.5L V6, RWD/4MATIC)
• 2012–2016 Mercedes-Benz E350 (W212, 3.5L V6, RWD/4MATIC)
• 2014–2018 Mercedes-Benz E400 (W212/W213, 3.0L V6 Turbo, RWD/4MATIC)
• 2017–2018 Mercedes-Benz E43 AMG (W213, 3.0L V6 Turbo, 4MATIC)
• 2019–2020 Mercedes-Benz E450 (W213, 3.0L V6 Turbo, RWD/4MATIC)
• 2015–2017 Mercedes-Benz CLS400 (C218, 3.0L V6 Turbo, RWD/4MATIC)
• 2014–2020 Mercedes-Benz CLA45 AMG (C117, 2.0L I4 Turbo, 4MATIC)
• 2015–2016 Mercedes-Benz GL450 (X166, 3.0L V6 Turbo, 4MATIC)
• 2015–2019 Mercedes-Benz GLA45 AMG (X156, 2.0L I4 Turbo, 4MATIC)
• 2017–2023 Mercedes-Benz GLC43 AMG (X253, 3.0L V6 Turbo, 4MATIC)
• 2016–2019 Mercedes-Benz GLE400 (W166, 3.0L V6 Turbo, 4MATIC)
• 2016–2018 Mercedes-Benz GLE350 (W166, 3.5L V6, RWD/4MATIC)
• 2017–2019 Mercedes-Benz GLE43 AMG (W166, 3.0L V6 Turbo, 4MATIC)
• 2016 Mercedes-Benz GLE450 AMG (W166, 3.0L V6 Turbo, 4MATIC)
• 2016–2018 Mercedes-Benz GLE550e (W166, 3.0L V6 Turbo PHEV, 4MATIC)
• 2017–2019 Mercedes-Benz GLS450 (X166, 3.0L V6 Turbo, 4MATIC)
• 2012–2015 Mercedes-Benz ML350 (W166, 3.5L V6, RWD/4MATIC)
• 2015 Mercedes-Benz ML400 (W166, 3.0L V6 Turbo, 4MATIC)
• 2018–2020 Mercedes-Benz S450 (W222, 3.0L V6 Turbo, RWD/4MATIC)
• 2015–2017 Mercedes-Benz S550e (W222, 3.0L V6 Turbo PHEV, RWD)
• 2019–2020 Mercedes-Benz S560e (W222, 3.0L V6 Turbo PHEV, RWD)
• 2015–2016 Mercedes-Benz SL400 (R231, 3.0L V6 Turbo, RWD)
• 2017–2020 Mercedes-Benz SL450 (R231, 3.0L V6 Turbo, RWD)
• 2017–2020 Mercedes-Benz SLC43 AMG (R172, 3.0L V6 Turbo, RWD)
• 2014–2015 Mercedes-Benz E400 Hybrid (W212, 3.5L V6 Hybrid, RWD)
• 2016–2018 Mercedes-Benz G550 (W463, 4.0L V8, 4WD)

Fitment Notes

• NGK 96427 corresponds to NGK service number SILZKFR8G7S.
• This is a specially indexed Laser Iridium High Ignitability spark plug; use only where the vehicle's OE specification calls for this indexed plug.
• Mercedes-Benz C43 AMG, GLC43 AMG, CLA45 AMG, GLA45 AMG, and other AMG applications require the exact engine and OE specification to be confirmed.
• Some 3.5L V6 applications are fuel-system or ignition-configuration dependent; verify the OE plug reference before ordering.
• G550 applications are limited to the cataloged 4.0L V8 configuration.
• Most V6 applications require 6x plugs; 4-cylinder CLA45/GLA45 applications require 4x; the G550 V8 requires 8x.
• 2024–2026 Mercedes-Benz applications are not confirmed for NGK 96427.

Features

• NGK Laser Iridium High Ignitability spark plug.
• Fine-wire iridium center electrode promotes high ignitability.
• Projected Square Platinum Electrode (PSPE) ground design supports consistent spark performance.
• Platinum ground-electrode tip provides enhanced wear resistance.
• 98% pure copper core promotes efficient heat dissipation.
• High-grade alumina ceramic insulator provides strong dielectric and thermal resistance.
• Trivalent metal plating provides corrosion resistance and anti-seizing properties.
• Integrated resistor suppresses ignition-system electrical interference.
• J-gap ground configuration provides the specified spark path.
• Flat-seat design uses a gasket washer for combustion-chamber sealing.
• Long-projection center electrode supports the specified Mercedes-Benz combustion-chamber geometry.
• OE-equivalent indexed design is engineered for compatible Mercedes-Benz ignition systems.

Specifications

• Brand: NGK
• Part Number: 96427
• Service Number: SILZKFR8G7S
• Product Type: Laser Iridium High Ignitability Spark Plug
• Thread Size: M12 x 1.25
• Thread Diameter: 12 mm
• Reach: 26.5 mm
• Hex Size: 14 mm
• Seat Type: Flat
• Washer Type: Flat
• Center Electrode Material: Iridium
• Center Electrode Design: Fine Wire
• Ground Electrode Quantity: 1x
• Ground Electrode Tip Material: Platinum
• Ground Electrode Design: Projected Square Platinum Electrode (PSPE)
• Ground Configuration: J-Gap
• Heat Range: NGK 8
• Pre-Gap: 0.7 mm / 0.028 in.
• Resistance: 1,000 ohms
• Terminal Type: Cup
• Insulator Material: Ceramic
• Center Electrode Core: Copper
• Center Electrode Projection: Long Projection
• Quantity: 1x Spark Plug

Included Components

• 1x NGK 96427 Laser Iridium High Ignitability Spark Plug

Product Description

The NGK 96427 Laser Iridium High Ignitability spark plug is an OE-equivalent replacement designed for a broad range of Mercedes-Benz gasoline engines. Also identified by service number SILZKFR8G7S, it uses a fine-wire iridium center electrode and a projected square platinum ground electrode to deliver reliable ignition, consistent combustion, and extended electrode durability.

The 96427 features an M12 x 1.25 thread, 26.5 mm reach, 14 mm hex, flat seat, 0.7 mm pre-gap, and NGK heat range 8. Its 98% pure copper core assists heat transfer, while the high-grade ceramic insulator provides thermal and dielectric protection. Trivalent metal plating helps resist corrosion and thread seizure, and the 1,000-ohm resistor helps suppress ignition-system interference.

This plug is cataloged across Mercedes-Benz applications ranging from 2.0L four-cylinder AMG engines to 3.0L and 3.5L V6 engines and selected 4.0L V8 applications. Because 96427 is a specially indexed plug, exact engine, chassis, and OE specification must be verified before installation. The plug is sold individually.