[Wayne]

DCTs are performance gear boxes. A lot of software has been developed to make them drive gently, mimicking a torque convertor automatic. But at the end of the day you have a computer attempting to feather a clutch pedal.

These transmissions perform best when they are driven aggressively. Otherwise they will buck and stutter a bit from time to time. It's just their nature, especially when downshifting a you coast to a stop. Brake / stop more aggressively and the problem diminishes and generally completely goes away.

 

[Wayne]

Start by changing the diff oil. IMHO this needs to be done every 10K miles. Others on this Forum have found an oil change cured their problem. No guarantees, but an easy place to start.

 

[Wayne]

Moving forward ... motor oil changes at 5K miles with diff oil at 10K miles (every other oil change). These are both easy DIYs that will save you more than enough money on the first time to pay for the tools and more.

Then we get into what kind of motor oil and Ceratec or MoS2 or not. This can get emotional!!!!!

The diff gets the MB oil regardless of the high price.

 

[Wayne]

Dual clutch transmissions are meant to be driven in a sporty manner in order for the computers to rev match and fluidly operate the clutches. If you slow down gradually often times the downshift to first can be harsh. It's a bit in the nature of the beast.

That being said, you can adapt your driving style to minimize this. Have you tried slowing down later and decelerating harder when coming to a full stop?

As with anything mechanical, some of these transmissions are smoother than others. Add in the computers attempting to mimic human inputs on the clutch pedal and a lot can happen.

But on line communication can leave a lot out. Sorry if the above is off mark.

 

[Wayne]

Start by changing the diff oil. That has fixed the clunk for many on this Forum.