{"product_id":"ignition-coil-iridium-spark-plugs-for-mercedes-benz-slk-class-2012-2016-5-5l","title":"Ignition Coil + Iridium Spark Plugs for Mercedes Benz SLK-Class (2012-2016) 5.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil and Spark Plug Tune-Up Kit for 2012-2016 Mercedes Benz SLK-Class 5.5L (R172 \/ M152)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Ignition Coil + Iridium Spark Plugs kit restores secondary ignition voltage and consistent flame kernel propagation on the 2012-2016 Mercedes Benz SLK55 AMG to eliminate cylinder misfires and erratic idle under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mercedes Benz SLK-Class Thermal Degradation and Secondary Breakdown\u003c\/h3\u003e\n\u003cp\u003eIn the tightly packaged engine bay of the \u003cstrong\u003eR172\u003c\/strong\u003e chassis, the naturally aspirated \u003cstrong\u003eM152\u003c\/strong\u003e 5.5L V8 operates under extreme thermal soak. Over time, internal epoxy insulation and primary copper windings within factory coil packs degrade, leading to dielectric breakdown and micro-arcing. Simultaneously, cylinder deactivation cycles (AMG Cylinder Management) cause uneven electrode erosion and carbon deposits across OEM plugs, broadening the spark gap beyond factory tolerance. This increased resistance forces degraded coils to demand higher dwell energy, causing high-RPM spark blowout, rough running, and stored pending DTC misfire codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis service kit replaces all eight coil-on-plug units and plugs with matched OE-specification components. The ignition coils feature high-temp magnetic cores and reinforced PBT thermoplastic housings resistant to dielectric breakdown. Matched with double iridium \u003cstrong\u003eBosch ZR6SII3320\u003c\/strong\u003e spark plugs, the fine-wire center electrode lowers the required ionization voltage, ensuring clean direct-injection combustion across both 4-cylinder eco-mode and full 8-cylinder dynamic operation under 12.6:1 compression.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2012-2016 Mercedes Benz SLK-Class\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eM152 \/ R172\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e415 hp \/ 398 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eUF741, A2769063700, 2769063700, 2769060501, 0040103070\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2012 Mercedes Benz SLK-Class SLK55 AMG 5.5L V8 (M152.980)\u003c\/li\u003e\n  \u003cli\u003e2013 Mercedes Benz SLK-Class SLK55 AMG 5.5L V8 (M152.980)\u003c\/li\u003e\n  \u003cli\u003e2014 Mercedes Benz SLK-Class SLK55 AMG 5.5L V8 (M152.980)\u003c\/li\u003e\n  \u003cli\u003e2015 Mercedes Benz SLK-Class SLK55 AMG 5.5L V8 (M152.980)\u003c\/li\u003e\n  \u003cli\u003e2016 Mercedes Benz SLK-Class SLK55 AMG 5.5L V8 (M152.980)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the R172 SLK-Class?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2012-2016 Mercedes Benz SLK-Class equipped with the M152 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these spark plugs require manual gapping prior to installation?\u003c\/strong\u003e\u003cbr\u003e No, the double iridium plugs are pre-gapped to OEM specification for the M152 direct-injection cylinder head; verify gap visually and do not alter the delicate fine-wire tip.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mercedes Benz Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEuropean direct-injection engines require precise secondary voltage to preserve ECU calibration and prevent catalytic converter fouling. This kit guarantees clean combustion, stable ignition timing, and zero check engine lights across the full RPM range.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50625870070008,"sku":"DS-ENEMABT6A","price":499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-slk-class-2012-2016-5-5l-1.jpg?v=1790352594","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-slk-class-2012-2016-5-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}