Genuine Mercedes-Benz Spark Plugs – M270 / M274 / M276 / M282 Engines

Specification Overview

Genuine Mercedes-Benz spark plug with iridium-tipped center electrode and platinum ground electrode. Manufactured by NGK (SILZKFR8H7S / 90654) and Bosch (96347) , this is the factory-spec ignition component for Mercedes-Benz’s current-generation four-cylinder and selected six-cylinder turbocharged petrol engines.

• Type: Spark plug with iridium center electrode / platinum ground electrode

• Thread Size: M12 x 1.25

• Thread Length: 26.5 mm

• Hex Size: 14 mm

• Electrode Gap: 0.7 mm (0.028 inches)

• Spark Position: 5.5 mm

• Electrode Material: Iridium (center) / Platinum (ground)

• Resistance: 1 kOhm interference suppression

• OE Numbers: 2701590700, 270-159-07-00, A2701590700

• Cross References: NGK 90654 / 92725, Bosch 96347 / 7434, 0041597903, 0041597003

• Manufacturer: NGK / Bosch (OEM supply)

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Application & Engine Fitment

This spark plug is the factory-spec replacement for the following Mercedes-Benz petrol engine families:

⚠️ Important: M270 engines are transversely mounted (front-wheel-drive platforms). M274 engines are longitudinally mounted (rear-wheel-drive platforms). Both use this same spark plug. Selected M276 V6 variants also use this plug.

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Comprehensive Model Fitment:

⚠️ Important: Spark plug application depends on specific engine configuration. Always verify by VIN (17-digit chassis number) to ensure correct fitment.

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Service Life & Change Intervals (Technical Data)

Standard Recommended Interval:

• 60,000 km or 4 years (under normal operating conditions)

Critical Adjustment for Kampala (Severe Operating Conditions):
The operational climate (ambient temperatures 20°C–40°C), high humidity, stop-and-go urban traffic, and variable fuel quality classify as “Severe Duty” per MB Work Instructions. Spark plugs in turbocharged direct-injection engines experience higher thermal stress and electrode wear under these conditions.

Recommended Replacement Interval under East African operating parameters:

• Maximum: 40,000 km or 3 years (whichever occurs first)

• Frequent short trips / heavy urban use: 30,000 km or 2 years

⚠️ Important: Spark plugs should be replaced as a complete set (4 plugs for 4-cylinder engines, 6 plugs for V6 engines). Replacing only one or two plugs will cause uneven combustion and potential engine damage.

Failure Symptoms – When to Replace:

• Engine misfires or rough idling

• Check Engine Light illuminated

• Hesitation or loss of power under acceleration

• Poor fuel economy

• Difficulty starting the engine

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Packaging & Pricing (Alps Autoz Kampala)

Often Replaced Together:
For a complete ignition service, replace the following simultaneously:

• Spark plugs (set of 4 or 6, as required)

• Ignition coils (if showing signs of failure)

• Engine air filter (per chassis application)

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Technical Notes for the Workshop

• Gap Setting: Factory pre-gapped at 0.7 mm. Do not attempt to adjust – iridium/platinum electrodes are fragile and can be damaged.

• Torque Specification: 23 Nm. Over-tightening can damage the cylinder head; under-tightening can cause heat transfer issues.

• Anti-Seize: Not required on genuine Mercedes-Benz spark plugs with factory-applied anti-seize coating.

• Genuine vs. Aftermarket: Genuine MB A2701590700 is manufactured by NGK and Bosch to OEM specifications. Equivalent aftermarket brands:

  • NGK SILZKFR8H7S (90654 / 92725)

  • Bosch 96347 / 7434

• Storage: Shelf life of 5 years in unopened, sealed packaging. Store in a dry environment away from direct sunlight.

• Compatibility Note: This spark plug is not compatible with M271, M272, M273, OM651, OM642, or any diesel engines. Use only for M270, M274, M276, and M282 petrol applications.

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Alps Autoz – Kampala