DSG.

The dual-clutch gearbox essentially consists of two independent gearbox units. With dual-clutch technology – two wet clutches in a common housing – both gearboxes are connected under load to the engine alternately depending on the current gear via two drive shafts. Clutch 1 serves the first gearbox unit with 1st, 3rd, 5th and reverse gear and clutch 2 the second gearbox unit with 2nd, 4th and 6th gear.
Each gearbox unit is assigned an output shaft that applies the torque to the driven wheels via the differential gear.

Thanks to the dual-clutch design the DSG is remarkably more efficient than the conventional automatic transmission that uses a hydraulic torque converter. This and its low weight, together with the intelligent transmission control, are vital prerequisites if vehicles with the dual-clutch gearbox are to achieve the same or even lower fuel consumption, depending on the style of driving, than a manual gearbox.