VW - AUdi - Seat - Skoda
Most of the drivers who own a VW Audi Group (VW - Audi - Seat - Skoda) vehicle with a Direct Shift Gearbox (DSG) will not know they have a dual-clutch transmission connected to the engine. It is not until a transmission component fails or a service interval elapses that they learn about DSG.
direct shift gearbox
A DSG transmission is lighter than a comparable automatic with the same number of speeds. And, less weight equals better fuel efficiency.
Internally, the dual-clutch transmission is more efficient than an automatic because there are fewer moving parts. With an automatic transmission, the engine has to drive a pump and energy is lost in the torque converter and clutch packs.
LUBRICATING HYDRAULIC FLUID
Instead of a linkage connected to a shifter, the shift forks are actuated by hydraulic solenoids. The actual shifting is done by opening one clutch and closing the other, and maintaining the power flow. The shifting behavior can be fine tuned by remapping software that allows very different characteristics using the same DSG transmission.
Volkswagen uses a wet clutch setup. The transmission fluid lubricates and cools the clutches, and it contains friction modifiers that influence the friction level of the clutches. These additives can become depleted over time.
The same fluid that lubricates the clutches also lubricates the internal components of the transmission. Like with a manual transmission, the shock loads of the gears can degrade the fluid over time.
The fluid also acts as a hydraulic fluid. Hydraulic solenoids engage the DSG clutch and gears on the shafts. If the fluid is contaminated or oxidized, it can damage the solenoid’s seals causing internal leaks, or cause the operation of the solenoid to become seized.
Fluid maintenance is key in keeping a VW Audi Group DSG transmission operating as designed. Manufacturers recommend a 40,000 miles fluid service interval for most DSG transmissions, but recommends a more frequent service interval if the vehicle is used for heavy duty or towing applications.
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