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Safety functions of gearbox control unit > < Notes on dual clutch gearbox 0B5
General notes
General notes
Gearbox
The engine torque is transferred to the gearbox via the flywheel. The layout of the gearbox is basically similar to that of a 7-speed manual gearbox. The two multi-plate "wet" clutches are regulated hydraulically and actuated alternately so that the gearbox is operated like an automatic gearbox, i.e. the gears are engaged automatically (or manually via the tiptronic function). There is no clutch pedal. For further information please refer to → No.429.
Technical data
   
Manufacturer's designationDL501-7Q
Service designation0B5
Sales designationS tronic
WeightApprox. 142 kg (with flywheel, ATF and oil filling)

ATF and gear oil (MTF)
The dual clutch gearbox 0B5 uses separate oil chambers for ATF and gear oil (MTF).
ATF = automatic transmission fluid
The gear oil in the dual clutch gearbox 0B5 is also referred to as MTF (manual transmission fluid).
t  For the dual clutch and the hydraulic sections, use only the ATF available as a replacement part for dual clutch gearbox 0B5 → Electronic parts catalogue.
t  For the gearbox section, the front final drive and the transfer box, use only the gear oil (MTF) available as a replacement part for dual clutch gearbox 0B5 → Electronic parts catalogue.
t  Other types of ATF or gear oil cause malfunctions and/or failure of the gearbox.
Variation of gear-change points for gradients
An additional gear change map automatically selects gear changes for gradients depending on accelerator pedal position and driving speed.
l  Gear change map for extreme uphill gradients is matched to engine output.
l  Gear change map for extreme downhill gradients is matched to the braking effect of the engine.
l  Increased engine braking effect can also be obtained by directly selecting a specific gear via the tiptronic function, e.g. when towing a trailer on downhill gradients
   

Safety functions of gearbox control unit > < Notes on dual clutch gearbox 0B5