Set of 8 iridium spark plugs NGK 97566 SILZKFR8F7S Mercedes-Benz C190 E63 AMG GLS580 S560 GT G550 S560 V8

Set of 8 Iridium Spark Plugs NGK 97566 SILZKFR8F7S Mercedes-Benz C190 E63 AMG GLS580 S560 GT G550 S560 V8

Premium solution for high-performance V8 engines

This set of 8 NGK 97566 spark plugs (part number SILZKFR8F7S) is specially designed for flagship eight-cylinder Mercedes-Benz engines. The Laser Iridium series plugs combine the use of two precious metals, which is critically important for engines with high boost and turbocharging. The iridium-tipped center electrode and platinum-tipped side electrode provide maximum wear resistance under extreme thermal and mechanical loads typical for AMG modifications and heavy-duty SUVs of the GLS and G-Class series.

Efficient Ignition Technologies

The use of iridium allows for the manufacture of an ultra-thin center electrode, significantly reducing the required ignition voltage. This ensures reliable engine start in cold weather and stable spark formation at high speeds. The copper core, occupying 98% of the internal volume of the center electrode, provides efficient heat dissipation, preventing spark plug overheating and detonation. The use of high-quality aluminosilicate ceramic as an insulator eliminates dielectric breakdown, directing all spark energy precisely into the combustion chamber.

Durability and Protection of Ignition System Components

NGK SILZKFR8F7S plugs are equipped with a trivalent zinc-coated housing, which has excellent anti-corrosion properties and eliminates the need for additional lubricants during installation. Cold-rolled threads minimize the risk of cylinder head damage. The built-in interference suppressor resistor protects the complex onboard electronics of Mercedes-Benz vehicles from electromagnetic interference. The service life of iridium-platinum plugs significantly exceeds that of standard components, providing stable dynamic vehicle performance throughout the entire service interval.

Installation Recommendations and Compatibility

The plugs have a specific cup-shaped connector for connecting ignition coils and require the use of a 12-point 14 mm spark plug wrench. For proper V8 engine operation, the regulated tightening torque (15-25 Nm) must be observed to ensure the correct seating of the sealing ring and heat transfer. The set fully complies with the original manufacturer requirements (OEM numbers Mercedes-Benz A0041598103, A0041597503).

Technical Specifications

• Brand: NGK

• Brand registration country: Japan

• Material: iridium, platinum, high-quality aluminosilicate ceramic, nickel-plated steel, copper

• Size: thread diameter 12 mm, thread length 26.5 mm, wrench size 14 mm (Bi-Hex/12-point)

• Color: white, metallic silver

• Weight: 384 grams (set of 8 pcs.)

• Condition: new

• Product group: ignition system spare parts

• Purpose: ignition of the fuel-air mixture in eight-cylinder gasoline engines of Mercedes-Benz

• Compatibility: Mercedes-Benz engines M176, M177, M178 (V8 Biturbo); AMG GT models (C190, R190), C63 AMG (W205), E63 AMG (W212, W213), G500/G550 (W463), S560 (W222), GLC 63 AMG (X253), GLE 63 AMG (W166), GLS 580 (X167), GLS 63 AMG (X166)

• Features: iridium-tipped center electrode, platinum insert on the ground electrode, built-in 5 kOhm resistor, laser-welded electrodes, copper core (98%)

• Marking: SILZKFR8F7S

• Manufacturer's part number: 97566

• Quantity in set: 8 pieces

• Heat range: 8

• Thread pitch: 1.25 mm

• Gap: 0.7 mm

• Connection type: cup-shaped (Cup)

• Seal type: flat gasket

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

• Recommended tightening torque: 15–25 Nm