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Hello all !
Been reading here for quite a while but now have something to contribute.
When starting off from a stop the Tip's default is to start from 2nd gear, whether you're in Manual mode or Automatic. The "stutter" will happen all the time but is most noticed while pulling away in a casual, non-aggressive accelerating manner. You start off - then notice that it feels like it shifted but didn't shift gears. This is the torque converter locking up. No problem, normal.
It is highly recommended not to power flush the Tiptronic !! Bad things can happen. Instead, do a succession of fluid changes in a short amount of time. Each time the fluid is changed, you put in approx 4-1/2 liters of new fluid. Drive for a week to mix it up, then do another change. If you figure that after the first change you've got 50/50 old and new, a second change would make it 75/25, a third would be 87.5/12.5, etc. You don't get all the fluid out unless you take the trans and converter out of the car and disassemble.
Next, make sure you get the amber color Pentosin fluid, not the red color. After purchasing my 04 Boxster with 30k miles I took it to a highly respected independent that worked mainly on German cars. Did the IMS, RMS, AOS, plugs, oil, and trans service. They grabbed the wrong Pentosin made for the Mercedes Tip. The trans ran better and worse at the same time. I thought it was due to being low or too full, yes both are possible. When I checked the fluid level, red fluid came out! After that I changed the fluid myself even though they offered to make things right. I just didn't trust the situation and I found out it's pretty easy to do. After several changes the trans is doing great.
BTW, the IMS was in pretty good shape but the spindle had a wobble of about 1/16", so I am very glad I had it changed to the LN Engineering bearing.
Hope this info helps those that are in need.
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