Ignition Coil + Spark Plugs for Mercedes Benz CL-Class (1998-1999) 6.0L

Direct-Fit Ignition Coil and Spark Plug Tune-Up Kit for 1998-1999 Mercedes Benz CL-Class

What it Does: The ignition coil and spark plug kit replaces aged, heat-degraded ignition components on the 1998-1999 Mercedes Benz CL-Class to eliminate high-load misfires, stabilize idle quality, and restore factory combustion efficiency across all 12 cylinders.

The Stock Mercedes Benz CL-Class Thermal Breakdown Vulnerability

The 6.0L V12 engine bay of the C140 chassis operates under severe thermal loading due to tight packaging and high underhood temperatures. Over time, continuous heat cycling degrades the internal copper windings and primary epoxy insulation of the factory ignition coils. This breakdown causes dielectric breakdown, micro-arcing, and intermittent misfires under throttle tip-in or sustained load. Compounding this, extended plug gap erosion from aged copper or platinum electrodes increases secondary circuit resistance, putting excess electrical strain on the coil drivers and causing catalytic converter overheating or cylinder deactivation codes.

The Engineering Solution

This comprehensive 12-coil and 12-spark plug service kit delivers a complete refresh designed to match factory resistance and dwell parameters for the Bosch ME engine management system. Each ignition coil features high-dielectric epoxy potting, thermal-resistant PBT housings, and premium magnetic-grade silicon steel laminations to prevent internal arcing and heat soak saturation. The matched spark plugs feature high-grade nickel and copper core metallurgy engineered to maintain precise electrode gaps, resist fouling, and ensure clean flame kernel propagation under high compression.

Technical Specifications

Compatibility

• 1998 Mercedes-Benz CL-Class CL600 Coupe 6.0L V12 (C140 / M120.982)
• 1999 Mercedes-Benz CL-Class CL600 Coupe 6.0L V12 (C140 / M120.982)

Frequently Asked Questions

Does this fit the C140 CL-Class?
Yes, this kit is specifically designed for the 1998-1999 Mercedes Benz CL-Class (C140) equipped with the 6.0L M120 V12 engine.

Should all 12 coils and plugs be replaced at the same time?
Yes, replacing all 12 simultaneously ensures uniform secondary resistance across both cylinder banks, preventing uneven idle and misfire fault codes.

The Mercedes Benz Precision Standard

Preserve the balanced smoothness of your classic V12 grand tourer with components engineered to exact German tolerances, ensuring clean cold starts, error-free ECU communication, and zero CEL illumination.