Performance Ignition Coils for Mercedes-Benz C300 C350 E350 (2017-2020) - 6 Set

High-Output Performance Ignition Coils & Spark Plugs for 2017-2020 Mercedes-Benz C-Class, E-Class, GL-Class, SL-Class (M278 / M157)

Direct Replacement Ignition Kit: Restores factory spark energy and prevents high-RPM misfires by replacing degrading OEM ignition coils and spark plugs.

The Stock Mercedes-Benz Thermal Breakdown Weakness

Factory ignition coils on high-output Mercedes-Benz biturbo engines frequently suffer from thermal degradation and internal epoxy breakdown due to the extreme under-hood temperatures generated by twin-turbocharger layouts. This aggressive heat soak compromises the internal primary and secondary copper windings, leading to erratic spark delivery, noticeable hesitation during acceleration, and inevitable cylinder misfires under heavy load. Over time, the internal electrical resistance increases, causing a weak or delayed spark that reduces combustion efficiency, increases emissions, and repeatedly triggers persistent check engine lights (CEL) or drivetrain malfunction warnings.

The Engineering Solution

These replacement UF741 ignition coils are engineered to exceed factory standards by utilizing upgraded dielectric epoxy and high-temperature silicone boots, maximizing thermal resistance against the engine bay's punishing heat cycles. Paired with genuine Bosch ZR6SII3320 spark plugs, this comprehensive service kit guarantees optimal spark duration and consistent voltage output. The enhanced internal winding construction decreases primary resistance, ensuring rapid coil recharge times at elevated RPMs. This effectively eliminates spark blow-out under high boost pressure, resulting in a significantly smoother idle, restored throttle response, and precise ignition timing control across the entire powerband.

Technical Specifications

Compatibility

• Mercedes-Benz CLS550 2017-2018 4.7L
• Mercedes-Benz E550 2017-2017 4.7L
• Mercedes-Benz SL550 2018-2020 4.7L
• Mercedes-Benz CLS63 AMG S 2017-2018 5.5L
• Mercedes-Benz G63 AMG 2018-2018 5.5L
• Mercedes-Benz GLE63 AMG 2018-2019 5.5L
• Mercedes-Benz GLE63 AMG S 2018-2019 5.5L
• Mercedes-Benz GLS63 AMG 2018-2019 5.5L
• Mercedes-Benz SL63 AMG 2018-2018 5.5L

The Mercedes-Benz Calibration Standard

Designed to meet the precise electrical tolerances of sophisticated Mercedes-Benz ME engine management systems, these coils and plugs ensure zero check engine lights and perfectly synchronized combustion events for lasting European reliability.