Dual-mass flywheel S-tronic

S-tronic Dual-Mass Flywheel

S tronic gearboxes, known from Audi models and related VAG group brands, are extremely popular thanks to combining the convenience of an automatic with the dynamics of a manual transmission. One of the key components working with this technology is the dual-mass flywheel, commonly referred to as the “dual-mass.” Its main role is to reduce vibrations transferred from the engine to the gearbox. Although this solution significantly improves driving comfort, it can also be a source of problems.

Advantages of using a dual-mass flywheel

The dual-mass flywheel in S tronic gearboxes is designed to dampen engine operation irregularities, especially at low revs. Thanks to this:

• the driver experiences higher driving comfort – no excessive vibrations or noise,
• the gearbox and other drivetrain components are better protected against overloads,
• gear changes become smoother, which perfectly matches the character of S tronic.

In practice, this means less wear of the internal transmission components and more natural vehicle behavior, especially in the city and during dynamic acceleration.

Typical dual-mass flywheel failures in S tronic

Despite its many advantages, the dual-mass flywheel also has weak points. In S tronic gearboxes, especially with higher mileage or improper use, the most common issues include:

• knocking and rattling noises at idle,
• vibrations during acceleration, especially at low revs,
• jerks when starting or shifting gears,
• in extreme cases – disintegration of the vibration dampers, which can lead to more serious gearbox damage.

How to extend the lifespan of a dual-mass flywheel?

To avoid premature failures, it is worth remembering a few rules:

• Avoid driving at low revs – the engine and gearbox work less smoothly then, which heavily loads the dual-mass flywheel.
• Service the S tronic gearbox regularly – changing the oil every 60,000 km is essential. Contaminated oil worsens mechatronic performance, which in turn increases jerks transferred to the flywheel.
• Be gentle with the throttle when starting – sudden starts and frequent “over-revving” shorten the lifespan of this component.
• Do not ignore the first symptoms – quick reaction can save the gearbox from costly repairs.