Ignition and Iridium Spark Plugs for Mercedes-Benz SLK250 (2012-2015) 1.8L
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High-Performance Ignition Coils and Iridium Spark Plugs for 2012-2015 Mercedes Benz SLK-Class
This comprehensive ignition service kit replaces degraded factory coils and plugs to restore proper spark delivery, resolve misfires, and improve combustion efficiency for the 1.8L engine.
The Stock SLK-Class Ignition Weakness
Over time and repeated thermal cycles, the OEM ignition coils on the Mercedes-Benz R172 chassis are prone to internal resistance degradation. The factory epoxy resin encapsulating the primary and secondary windings breaks down from engine bay heat soak, leading to voltage leaks and weak spark output. This degradation typically manifests as rough idling, delayed throttle response, or intermittent cylinder misfires under heavy load, especially as the factory spark plugs exceed their intended service intervals and their electrode gaps widen beyond specification.
The Engineering Solution
This upgraded ignition kit resolves these voltage deficiencies by utilizing high-purity copper wire internals that resist thermal breakdown and ensure consistent electrical conductivity. The coils are built with OE+ durability, employing high-temperature silicone boots and advanced epoxy potting to withstand extreme underhood conditions and prevent voltage arcing. Paired with advanced iridium spark plugs featuring a fine-wire center electrode, this package maximizes spark concentration. The iridium construction requires significantly less firing voltage while providing a more complete combustion event, resulting in smoother idle stabilization, restored power delivery, and up to a 15% improvement in overall ignition energy efficiency.
Technical Specifications
| Fitment | 2012-2015 Mercedes Benz SLK-Class |
| Engine / Chassis | M271 EVO 1.8L Turbo / R172 |
| Stock Output | 201 hp / 229 lb-ft (Approx) |
| Part Number | UF658, UF-658, C931, GN10552, 0001502580, 0040100072 |
Compatibility
- 2012 Mercedes-Benz SLK250 1.8L
- 2013 Mercedes-Benz SLK250 1.8L
- 2014 Mercedes-Benz SLK250 1.8L
- 2015 Mercedes-Benz SLK250 1.8L
The Mercedes Benz Precision Caliber
Engineered to meet demanding European tuning standards, this ignition package ensures precise engine timing and reliable operation without triggering check engine lights (CEL), maintaining the refined driving dynamics expected from your R172 roadster.
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