A prototype of the Mercedes-Benz S-Class Cabriolet was spied performing final testing rounds on the Nürburgring.

A prototype of the Mercedes-Benz S-Class Cabriolet was spied performing final testing rounds on the Nürburgring.

It's been a long time in the making but the open top S-Class is almost here as Mercedes-Benz will stage its world premiere in September at the Frankfurt Motor Show. It will obviously look a lot like the S-Class Coupe, only with an electrically-foldable soft top replacing the fixed metal roof while the rear end is expected to feature some minor body changes as the shape of the trunk has been changed to accommodate the fabric roof.

The AIRSCARF (neck-level heating) and AIRCAP (air deflector) systems are a given like on all cabrios from Mercedes-Benz whereas the engine lineup should be nearly identical to the rest of the S-Class family. Both S63 and S65 AMGs will be added to the range shortly after the standard model's introduction, so expect the range-toppers to show up early next year.

S-Class project manager Martin Hulder has described the new high-end convertible as "a car for the star gazers", but obviously it won't come cheap as it will command a serious premium over the equivalent S-Class Coupe.

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