Ignition Coil and Iridium Spark Plugs for Mercedes Benz R-Class (2006-2011) 3.5L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2006-2011 Mercedes-Benz R-Class

What it Does: This complete 6-cylinder ignition service kit replaces deteriorated coil-on-plug units and worn spark plugs to eliminate misfires, restore lost combustion efficiency, and stabilize idle operation.

The Stock R-Class Secondary Ignition Degradation

The M272 engine in the W251 chassis generates substantial thermal load in the cylinder heads. Over extended heat cycles, factory coil-on-plug boots develop micro-fissures and primary/secondary insulation breaks down. This insulation degradation causes high-voltage dielectric leakage, spark blow-out under load, rough idling, hesitation, and recurring P0300-P0306 misfire trouble codes as plug gaps erode.

The Engineering Solution

This kit features 6 heavy-duty ignition coils manufactured with high-grade copper primary and secondary windings, housed in heat-resistant, impact-absorbing thermoplastic cases to prevent thermal breakdown. Coupled with 6 fine-wire iridium spark plugs providing high thermal conductivity and erosion resistance, this setup ensures consistent millijoule spark energy, fast flame-kernel propagation, and full OE-spec electronic signaling without ECU communication faults.

Technical Specifications

Compatibility

• 2006-2011 Mercedes-Benz R-Class (W251) R350 3.5L V6 (M272 Engine)

The Mercedes-Benz Precision Standard

Engineered to exact European electronic tolerances, this ignition package maintains stable secondary circuit resistance to protect sensitive ME-SFI engine control units, guaranteeing zero check-engine lights and immediate, smooth throttle response across all operating ranges.