In late 2008, an all-new seven-speed longitudinal[SUP]
[7][/SUP][SUP]
[13][/SUP]
S tronic[SUP]
[13][/SUP] version of the DSG transaxle went into series production (Volkswagen Group internal code: DL501, parts code prefix: 0B5).[SUP]
[8][/SUP] 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.[SUP]
[13][/SUP] However, this particular variant uses notably more plates â 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.[SUP]
[13][/SUP] Another notable change over the original transverse DSGs is the lubrication system[SUP]
[14][/SUP][SUP]
[15][/SUP] â Audi now utilise two totally separate oil circuits.[SUP]
[13][/SUP] 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 (ATF),[SUP]
[13][/SUP] 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.[SUP]
[13][/SUP] This dual circuit lubrication is aimed at increasing overall reliability, due to eliminating cross-contamination of debris and wear particles.[SUP]
[13][/SUP] I
t has a torque handling limit of up to 600 N·m (440 lb·ft),[SUP][7][/SUP] and engine power outputs of up to 330 kW (450
PS; 440
bhp).[SUP]
[7][/SUP] It has a total mass, including all lubricants and the dual-mass flywheel of 141.5 kg (312 lb).[SUP]
[7][/SUP]