Your Guide to DSG and S Tronic Gearboxes

The Direct Shift Gearbox (DSG), known as S Tronic in Audi models, originated as a breakthrough in race car technology. Designed for the racetrack, where rapid and seamless gear shifts are essential, this technology was first adapted for everyday use by Volkswagen with the launch of the Golf R32 in 2003. Audi followed shortly after, introducing the S Tronic with their Audi TT 3.2.

How they work

DSG and S Tronic revolutionised automatic transmission systems by employing two separate clutches for the odd and even gear sets. This configuration allows each clutch to operate independently, enabling the gearbox to switch gears almost instantaneously without the power loss typically seen in traditional automatic transmissions.

The dual-clutch setup also pre-selects the next gear before it’s needed, making gear changes faster and smoother. This advancement significantly reduces lag and provides drivers with quicker and more responsive acceleration than conventional systems, enhancing the driving experience with efficiency and performance.

The Differences Between DSG and S Tronic

While DSG and S Tronic gearboxes share the same dual-clutch technology, there are some key differences:

In essence, while the core technology remains the same, S Tronic gearboxes are fine-tuned to complement Audi’s performance requirements.

Types of DSG and S Tronic Gearboxes

This table compares various DSG and S Tronic gearboxes, showcasing their specifications and typical vehicle applications.

Gearbox Type	Speeds	Torque Capacity	Clutch Type	Specific Car Models	Branding
DQ250	6-speed	Up to 350 Nm	Wet-clutch	Volkswagen Golf GTI, Audi A3 2.0 TDI, Škoda Octavia vRS	DSG/S Tronic
DQ200	7-speed	Up to 250 Nm	Dry-clutch	Volkswagen Polo GTI, Audi A1 Sportback, Škoda Fabia Monte Carlo	DSG/S Tronic
DQ500	7-speed	Up to 600 Nm	Wet-clutch	Audi Q3 RS, Volkswagen Tiguan R, Škoda Kodiaq RS	DSG/S Tronic
DL501	7-speed	Up to 550 Nm	Wet-clutch	Audi A4 Quattro, Audi A5 Sportback, Audi Q5 TDI	S Tronic
DQ380	7-speed	Up to 380 Nm	Wet-clutch	Volkswagen Passat R-Line, Audi Q2 Quattro, Škoda Superb 4×4	DSG/S Tronic
DQ381	7-speed	Up to 420 Nm	Wet-clutch	Volkswagen Golf R, Audi S3, Škoda Karoq RS	DSG/S Tronic
DQ400e	6-speed	Up to 400 Nm	Wet-clutch	Volkswagen Passat GTE, Audi A3 e-tron, Škoda Superb iV	DSG/S Tronic

Why you need to have your DSG serviced

DSG and S Tronic gearboxes have a lot moving parts that work very closely together. They need to stay well-lubricated with clean transmission fluid, which helps the gears shift smoothly and keeps the system cool. Over time, this fluid can get dirty and less effective, which can make the gearbox less responsive and more prone to wear.

Additionally, these gearboxes are often used in higher-performance models that put more stress on the gearbox. Regular check-ups help catch and fix small issues before they turn into bigger, more expensive problems.

These gearboxes are controlled by sophisticated software that gets updates to improve performance and efficiency. Regular servicing is a chance to get these updates, ensuring your gearbox is always running with the latest technology.

What to expect during a DSG service

1. Transmission Fluid Change: One of the most critical aspects of a DSG service is changing the transmission fluid. This fluid lubricates all the moving parts within the gearbox, helps to transfer power effectively, and keeps the system cool during operation. Over time, the fluid degrades and collects debris, which can affect the gearbox’s performance. 
2. Filter Replacement: Along with the fluid change, the transmission filter is also replaced. The filter helps to trap debris and dirt particles, preventing them from circulating through the gearbox.
3. Diagnostic Checks: Technicians will usually conduct a thorough diagnostic check using specialised tools to read and interpret the electronic control unit (ECU) data. These checks can reveal any existing or potential issues within the gearbox, such as electronic glitches or irregularities in the transmission’s behaviour.
4. Software Updates: Manufacturers often release software updates to improve the function and integration of the gearbox with the vehicle’s other systems, enhance performance, or correct issues identified after the car has been released.
5. Mechanical Inspections: The service may include a physical inspection of the gearbox for any signs of wear or damage. This would involve checking the gearbox housing, the integrity of the seals, and the condition of the clutch assembly and actuators.
6. Test Drive: After the service, a test drive is often performed to ensure the gearbox operates smoothly and responds well to the updates and changes. This also helps verify that no further issues have arisen during the service.

How Often Should You Service Your DSG Gearbox?

Normally, you should service your DSG gearbox every 40,000 miles. However, if your car is tuned for higher performance, it will need more frequent servicing—about every 20,000 to 25,000 miles. This helps manage the extra stress on the gearbox and keeps your car running smoothly.

How Much Does DSG Servicing Cost in the UK?

A DSG gearbox service typically costs between £200 and £400. This price includes new transmission fluid, new filters, and labour. However, the cost can vary depending on the kind of car you have and where you go for service. 

Main dealers and performance specialists should ensure a thorough service and high-quality materials, but you’ll likely pay a premium for the upgraded service.