Checking tranny fliud levels in a Mercedes is tricky at best. Read your owner's manual. The level is heavily effected by the ATF's temp. According to my owner's manual, if the tranny is hot like just coming off the highway, you're supposed to let it cool for 30 min. before checking. I don't have my owner's manual in front of me to quote it, but I do remember it says if the tranny is cold, the fluid on the dipstick will be below the min. mark. When I get my owner's manual, I'll post exactly what it says.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member