In late 2008, an all-new seven-speed longitudinal S tronic
version of the DSG transaxle went into series production (Volkswagen Group internal code: DL501, parts code prefix: 0B5).
Initially, from early 2009, it is only used in certain Audi
cars, and only with longitudinally mounted engines
. Like the original six-speed DSG, it features a concentric
dual wet multi-plate clutch.
However, this particular variant uses notably more plates — the larger outer clutch (for the odd-numbered gears) uses 10 plates, whereas the smaller inner clutch (driving even-numbered gears and reverse) uses 12 plates.
Another notable change over the original transverse DSGs is the lubrication system
— Audi now utilise two totally separate oil circuits.
One oil circuit, consisting of 7.5 litres (1.65 imp gal; 1.98 US gal), lubricates the hydraulic clutches and mechatronics with fully synthetic specialist automatic transmission fluid
whilst the other oil circuit lubricates the gear trains and front and centre differentials
with 4.3 litres (0.95 imp gal; 1.14 US gal) of conventional hypoid gear oil
This dual circuit lubrication is aimed at increasing overall reliability, due to eliminating cross-contamination of debris and wear particles.
It has a torque handling limit of up to 600 N·m (440 lb·ft), and engine power outputs of up to 330 kW
; 440 bhp
It has a total mass, including all lubricants and the dual-mass flywheel of 141.5 kg (312 lb).