I have a 2007 GL450 and when it shifts from 2nd to 3rd, (or 3rd to 4th, it's hard to tell which), it shudders a little like it's slipping or something. I've been reading about red fluid vs blue, valve body problems, programming problems etc. Does anyone have this problem, or had this problem, and know what it is?
Unfortunately, I have the same problem in my 2013 E350W4. The vehicle was acquired new in December 2012 ... no issues. After a few weeks, the shuddering began. The dealer told me to drive the car, as it was learning how I was driving. At 1,700 miles, I brought it in for repairs - the software was updated. I was told I might need to drive the car for one year, before the car knew how I was driving (BS)!
At 4,200 miles, I brought the car back in again ... software updated yet again. Car was returned ... no difference. I was told (again) to drive it more, and to wait. I brought the car back at 8K miles (14 months old at this point). There was yet another software updated, and the car was FLASHED. The car drove AS NEW ... but ... after a few weeks, it learned to shudder all over again.
In driving 2013 & 2014 C300W4's and GLK350's (loaners), I can attest ... they do the same damn thing! This is absolute garbage! The transmission in the W212 body will be replaced by a 9-soeed in the 2015 model.
As a side note ... when I start my car ... there are two distinct noises. One stops after about 5-7 seconds ... the other continues. The first noise (the one which stops)? I was told that was in the tensioner. Once the car is turned off, the oil drains from the tensioner, and thus, when the car is eventually started, it is dry. MB offered to replace the tensioner with an updated version, which required removing the heads from the car (OMG - nice way to try to save a few dollars during the build-out). The second noise? Apparently, MB is using plastic parts on the inside of the engine. There is no way to fix the plastic-clatter ... which is very obvious when the car is idling. It sounds like a P.O.S.