With only that mileage you shouldn't need to drain the oil and refill.I have about 75K miles so I might not flush the gearbox this time and just do a drain and refill...Thx again!
Why did you think it was necessary to flush the transmission. I have 330,000 miles on my 300 STL and have change the transmission fluid every 25,000 miles without an issue.You'll need synthetic oil to mercedes-benz MB 236.14 standard.
There are many on the market with that standard. I recently used Fuchs Titan ATF 4134 - Mercedes MB 236.14. However I flushed the gearbox that uses a lot of oil in the process, as opposed to just draining and refilling.
Flushing the gearbox is quite a task, and I bought a 20 Litre container of MB 236.14 quality oil.