Set of NGK Laser Iridium Spark Plugs SILZKBR8D8S 97506 for BMW 2.0/3.0/4.0/4.4, set of 6 pcs

Set of 8 pcs NGK Laser Iridium SILZKBR8D8S 97506 Iridium Spark Plugs for BMW 2.0/3.0/4.0/4.4

Innovative Ignition Technology for BMW Engines

NGK Laser Iridium series spark plugs, model 97506 (SILZKBR8D8S), are engineered specifically to meet the rigorous demands of modern turbocharged BMW gasoline engines. The key feature is the use of iridium—one of the world's hardest and most corrosion-resistant precious metals. Due to iridium's ultra-high melting point, the center electrode is designed to be as thin as possible, allowing it to concentrate electrical charge and ensure stable spark formation even under extreme combustion chamber pressure. This guarantees reliable cold starts and consistent engine performance at high RPMs.

Durability and Protection of System Components

The design of these spark plugs includes a platinum chip on the ground electrode. The combination of iridium and platinum provides exceptional wear resistance, preventing the gradual expansion of the spark gap and thereby extending the product's service life up to 100,000 kilometers. Laser welding technology for the tips ensures assembly precision and connection strength. The high-quality ceramic insulator effectively prevents current leakage, while a special metal coating on the shell protects against corrosion and facilitates the removal process by preventing the plug from seizing to the cylinder head.

Maximum Efficiency and Economy

Utilizing the NGK Laser Iridium set contributes to more complete combustion of the air-fuel mixture, directly impacting vehicle performance. Improved ignitability allows for a reduction in the load on ignition coils, prevents cylinder misfires, and helps lower fuel consumption. The inclusion of a built-in interference suppression resistor eliminates negative impacts from the ignition system on onboard electronics and engine management sensors. This set is the ideal solution for BMW owners seeking to maintain factory power characteristics and smooth engine operation.

Detailed Compatibility Table by Model and Production Year

The spark plugs are intended for gasoline engines with volumes of 2.0, 3.0, 4.0, and 4.4 liters, including the N20, N55, S55, N63, and S63 series.

Technical Specifications

• Brand: NGK

• Brand Registration Country: Japan

• Material: Iridium, platinum, steel, nickel, ceramic

• Size: Thread diameter 12 mm, thread pitch 1.25 mm, thread length 26.5 mm, hex 14 mm

• Color: Silver metallic, white

• Weight: 290 grams

• Gender: Unisex

• Condition: new

• Product Group: Spark plugs

• Purpose: Ignition of the fuel mixture in BMW gasoline engines

• Compatibility: BMW 135i, 228i, 320i, 328i, 335i, 428i, 435i, 528i, 535i, 550i, 640i, 650i, 740i, 750i, M2, M3, M4, M5, M6, X1, X3, X4, X5, X6, Z4

• Features: Fine iridium center electrode, platinum-coated ground electrode, 5 kOhm interference suppression resistor, laser welding

• Gap: 0.8 mm

• Heat Range: 8

• Sealing: Flat washer

• Tightening Torque: 23 Nm

• Head Profile: 12-point (Bi-Hex)

• Terminal Type: Solid post (SAE)

• Equipment: Set of 6 spark plugs in individual packaging and a general cardboard box

• Service Life: up to 100,000 km

• Conductivity: High current stability at high temperatures