There is a recall for the ACS hydraulic reservoir located front left with Bonnet open ( stability control with air suspension ) but is more to it than replacing dipstick as air would have got into the system and therefor like any hydraulic system needs to be bled out and then also seals checked ..push dealer fix properly
Is worth the effort to get to know your MB and the oil and filter types and codes to do some basic maintenance yourself if you inclined and off to a dealer once a year .. unless you flushed with cash the dealer can do all ..!