Everyone here was in your place at one time or another - the only way you can learn is to ask, so please, ask away! I can assure you there are others out there who have wondered the same thing and were afraid to ask for fear of appearing 'stupid'.

No question is a dumb question, believe me. Welcome, enjoy, and please ask all you like! You can search here in the forum using terms like 'SLS' to find out more about this system - I recently wrote up a DIY on how to flush the system, which should be done every two years, like brake fluid. Unfortunately the service manual says little or nothing about the self leveling suspension. Makes no difference how you get it in there, as long as you get it in the reservoir without introducing any dirt in the process.Ī turkey baster can work well in this situation as will a big plastic hypodermic syringe (without a needle, of course!) Most importantly is that you use the MB approved fluid and nothing else! Regular hydraulic oil can destroy the system in short order. Yes, it's perfectly OK to fill the reservoir from the dipstick hole. The worst thing that might happen is a gentle nudge to the 'Search' function, as there are some topics that get addressed over and over.

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Hydraulic oil reservoir fill hole