Ignition Coil + Spark Plugs for Mercedes Benz GL-Class (2007-2012) 4.7L 5.5L

OEM-Grade Ignition Coil and Spark Plug Refresh Kit for 2007-2012 Mercedes Benz GL-Class 4.7L, 5.5L (X164 / M273)

What it Does: The complete ignition kit replaces aged ignition coils and worn plugs on the 2007-2012 GL-Class to restore spark energy, stabilize idle quality, and eliminate cylinder misfires under load.

The Stock Mercedes Benz GL-Class Dielectric Breakdown and Thermal Fatigue

In the X164 engine bay, the 32-valve M273 V8 generates substantial thermal soak between the cylinder heads and valve covers. Over thousands of heat cycles, the factory coil boots experience silicone hardening and micro-cracking, creating dielectric leakage paths where high-voltage arc shorts to the spark plug wells. Concurrently, factory plug gaps erode past allowable tolerances, which sharply increases secondary winding resistance. This extra electrical strain causes internal insulation failure inside the stock coils, triggering erratic P0300 through P0308 fault codes, sluggish throttle response, and unburnt fuel entering the catalytic converters.

The Engineering Solution

This direct-fit kit replaces all eight primary cylinders with matched high-output coil-on-plug modules and genuine NGK LKR7BGP platinum-tipped spark plugs. Built with high-temperature epoxy potting and heavy-gauge primary copper windings, these coils resist thermal breakdown and internal shorting up to 140°C. Matched with platinum electrodes, the setup preserves precise gap tolerances, lowers ionization voltage thresholds, and delivers consistent flame front propagation to maximize cylinder pressure throughout the power band. Direct replacement for OE references UF535 and 0001502780.

Technical Specifications

Compatibility

• 2007-2012 Mercedes Benz GL-Class GL450 4.7L V8 (M273)
• 2008-2012 Mercedes Benz GL-Class GL550 5.5L V8 (M273)

Frequently Asked Questions

Does this fit the X164 GL-Class?
Yes, this is a direct fit for the 2007-2012 Mercedes Benz GL-Class equipped with the M273 engine.

What is the recommended installation torque for the spark plugs?
Torque the included NGK spark plugs dry into the aluminum cylinder head to 20-25 Nm (15-18 lb-ft) without anti-seize to ensure correct thread depth and heat transfer.

The Mercedes Benz Precision Standard

European V8 powertrains rely on razor-thin ignition tolerances to run smoothly without triggering sensitive ME9.7 ECU diagnostic trouble codes. This kit delivers plug-and-play OE impedance and spark timing consistency, ensuring zero check engine lights and factory-spec idle stability across all eight cylinders.