The R231 SL-Class: How Mercedes-Benz Reinvented Its Iconic Roadster Through Aluminium Engineering
In short: When Mercedes-Benz launched the sixth-generation SL-Class in 2012, it marked a radical departure in construction. By shifting to an almost entirely aluminium space-frame, engineers shed 140 kilograms from the previous model. This lightweight architecture provided the foundation for a suite of high-tech features, from variable-tint glass to advanced driver assistance.
The development of the R231 began in 2007, with a final design approved for production in early 2010. The resulting vehicle, unveiled at the 2012 North American International Auto Show, was physically larger than its predecessor, measuring 182 inches in length and 83 inches in width. Beyond the weight-saving aluminium body, the car introduced several novel convenience technologies, including the MAGIC VISION CONTROL windscreen system and a hands-free boot lid that opens via foot movement near the rear bumper.
Performance options spanned from the standard 4.7-litre twin-turbo V8 to the high-output SL 65 AMG, which featured a bi-turbo V12 engine producing 1,000 N⋅m of torque. The AMG variants were distinguished by specific styling cues, such as the twin-blade radiator grille and carbon-fibre trim. For the 2017 model year, a mid-cycle facelift introduced the 9G-Tronic PLUS 9-speed automatic transmission to the SL 450 and SL 550 models, alongside cosmetic updates like revised front-end styling and adaptive LED headlights.
The R231 also refined the brand's signature folding hardtop. By 2017, the Vario-roof operation was updated to allow deployment at speeds up to 25 mph, and the luggage compartment partition no longer required manual intervention. Despite these technical advancements, market performance varied; the SL 63 AMG was eventually discontinued from 2019 due to poor sales. The generation remains a notable case study in balancing traditional luxury with the demands of modern, lightweight automotive engineering.
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- Summary by Intellect · source: Mercedes-Benz SL-Class (R231)
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