Mercedes is plotting a radical overhaul for one of its longest-running models: the Mercedes SL  roadster. Due in showrooms in the next 18 months, the new model is  being developed by Mercedes-AMG, with a focus on injecting a new level  of performance.
Last year, sports cars  contributed to slightly more than one per cent of the brand’s total  sales worldwide; around 28,400 sold in 2019, according to Merc’s own  figures. That’s a rise of 48 per cent over 2018, but by the firm’s own  admission, the AMG GT line-up accounts for most of that, with the compact SLC roadster and full-size SL dwindling in importance. 
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