Ignition Coil + Spark Plugs for Mercedes Benz G-Class (2009-2015) 5.5L

Direct-Fit Ignition Service Kit for 2009-2015 Mercedes Benz G-Class 5.5L (W463 / M273)

What it Does: The Ignition Coil and Spark Plug Kit replaces worn coil packs and degraded plugs on the 2009-2015 G-Class to eliminate secondary ignition breakdown, resolve cylinder misfires, and restore combustion efficiency.

The Stock Mercedes Benz G-Class Ignition Breakdown

The naturally aspirated 5.5L V8 in the W463 chassis operates inside a high-temperature, confined engine bay prone to severe thermal soak. Over time, heat cycles break down the dielectric insulation inside factory coil packs, while the silicone spark plug boots harden and micro-crack. This causes high-voltage current to leak to the cylinder head under load, triggering P0300-P0308 misfire trouble codes. Simultaneously, factory spark plug gaps widen from standard electrode erosion, forcing the coils to work harder, increasing primary dwell temps, and degrading fuel economy.

The Engineering Solution

This overhaul kit provides a matched set of 8 coil-on-plug assemblies paired with 8 fine-wire NGK LKR7BGP platinum spark plugs. Built with high-grade copper windings and premium epoxy potting, each coil resists heat-induced impedance drift and insulation puncture. The platinum electrode configuration lowers the ionization voltage threshold, providing immediate flame front propagation and cleaner burns. Installing both components simultaneously ensures uniform resistance across all cylinders, protecting upstream catalytic converters and restoring original throttle linearity.

Technical Specifications

Compatibility

• 2009-2015 Mercedes Benz G-Class G550 5.5L V8 (M273 Engine)

Frequently Asked Questions

Does this fit the W463 G-Class?
Yes, this is a direct fit for the 2009-2015 Mercedes Benz G-Class equipped with the M273 5.5L naturally aspirated V8 engine.

What is the proper spark plug installation torque?
Torque the spark plugs to factory specification (20 to 25 Nm / 15 to 18 lb-ft) into dry aluminum threads without anti-seize compound.

The Mercedes Benz Precision Standard

Maintaining the W463 electrical balance requires tight resistance parameters compatible with Bosch ME9.7 engine management. This kit guarantees clean secondary ignition output with zero false misfire codes or ECU diagnostic communication faults under heavy engine loads.