Iridium spark plug NGK 97566 SILZKFR8F7S Mercedes-Benz A/C/E/S-Class M274 M270 1 pc

Iridium Spark Plug NGK 97566 SILZKFR8F7S Mercedes-Benz A/C/E/S-Class M274 M270 1 pc

Technological Excellence of the Laser Iridium Series

The NGK 97566 spark plug (part number SILZKFR8F7S) belongs to the premium Laser Iridium line, designed to ensure maximum performance of modern Mercedes-Benz engines. The main feature of this model is the use of precious metals in the construction of both electrodes. The central electrode is tipped with ultra-hard iridium, while the ground electrode is equipped with a platinum pad. This combination of materials provides exceptional resistance to electrical erosion and the aggressive environment in the combustion chamber, ensuring stable spark formation throughout the service life.

Combustion Efficiency and Engine Protection

The thin central electrode minimizes ignition voltage requirements, ensuring confident engine start even at sub-zero temperatures and reducing the load on the ignition coils. The high concentration of spark energy contributes to more complete and faster combustion of the fuel-air mixture. This directly affects throttle response, idle stability, and prevents carbon deposits on the insulator. Using original NGK plugs helps maintain the factory power characteristics of the engine and minimizes the risk of detonation.

Design Advantages and Reliability

The plug is made in an elongated body with a high-density ceramic insulator, which effectively prevents spark breakdown to the body. A special anti-corrosion coating on the metal part protects the threaded connection from "seizing," facilitating subsequent disassembly. The built-in resistor suppresses electromagnetic interference, ensuring correct operation of the onboard electronics and engine management system sensors. A specially shaped sealing ring guarantees the combustion chamber's tightness, preventing gas leakage and compression loss.

Usage and Replacement

The installation of plugs should be carried out on a cold engine using professional tools. It is recommended to use a torque wrench to comply with the tightening torque specified by the manufacturer. Before installation, ensure the cleanliness of the spark plug wells. The replacement schedule is determined by the vehicle's service book, but the use of iridium alloy allows the plugs to be used significantly longer than standard nickel counterparts.

Selection Recommendations

This spark plug is the only option for owners of Mercedes-Benz vehicles with M270 and M274 series gasoline turbo engines. When selecting ignition system parts, it is critically important to adhere to the correct heat range and geometric parameters (thread length and pitch). Using the SILZKFR8F7S plug guarantees full technical compatibility with the original manufacturer's requirements (OEM numbers A0041598103, A0041597503).

• Brand: NGK

• Brand Registration Country: Japan

• Material: iridium, platinum, ceramic, steel

• Size: thread diameter 12 mm, thread length 26.5 mm, wrench size 14 mm

• Color: silver, white

• Weight: 48 grams

• Condition: new

• Product Group: ignition system spare parts

• Purpose: ignition of the fuel-air mixture in internal combustion engine cylinders

• Compatibility: Mercedes-Benz engines M270 and M274; Mercedes-Benz models A-Class (W176, W177), B-Class (W242, W246), C-Class (W204, W205), E-Class (W212, W213), CLA (C117), GLA (X156), GLC (X253), GLE (W166), SLK/SLC (R172)

• Features: two precious metals (iridium on the central and platinum on the side electrode), presence of a 5 kOhm interference suppression resistor, laser-welded electrodes

• Plug Type: Laser Iridium

• Marking: SILZKFR8F7S

• Part Number: 97566

• Heat Range: 8

• Thread Pitch: 1.25 mm

• Connection Type: cup-shaped (Cup)

• Gap: 0.7 mm

• Package Contents: spark plug in individual cardboard packaging (1 pc.)

• UPC: 087295975664

• OEM Compliance: Mercedes-Benz 0041598103, 0041597503, 0041597203, A0041598103, A0041597503, A0041597203

• Seat Type: flat with sealing washer

• Tightening Torque: 15-25 Nm