I think like all places it depends on the people that work there. Sometimes a Jiffy lube has a fellow or two that really care about cars but can you find a location like that and find a time when they are not super busy. I had such an experience with one of my other cars (not MB).

Those shifting issues will most likley not change because of a trans fluid change. MB transmissions shift harder than USA products and the flaring is a sign that there is some adjustments required. I just went through the process myself.

Are you into working on the car yourself? Then there is lots of information here to help you. This catagory is me after 20 plus years of not working on a car, I am enjoying the pride that comes with doing it right. Something about at least the 123's, they have soul, they have a spirit, they have something that I can't explain having owned many cars all new from vettes to SL's Cads to Camaro's and 4X4's. It may sound strange but it seems that a relationship develops in some odd way.

Not interested in working on it? Find a trans shop that really knows MB trans and have then service and adjust it.

Good luck and enjoy it.
Don

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it