Well for starters you need to remove the air filter. Then you can at least see it.
It did mine recently but I had it off the car.
The plug is on the front, but it may or man not come off, and in that case you will
need to open the front and drain it that way. I can't explain in the time I have how to do all this,
Look around the forum and mbworld.

 

I got to tie drain plug and used 3/16 hex like it says online, but it didn’t work. On forums it says people have gotten it open with 20-25 Torx tho maybe I need to try that. How much oil did you put in? Online it says it take 110ml, but when the supercharger is in the car and it’s level, you can’t fit the full 110ml in because it seeps out before u get there.
It’s kinda stressful I might just pay machanic to do it, but idk how much it will cost.

 

Best way is to take the supercharger out and do some maintenance.

You need beside basic tools, E-Torx, turbine oil, Eaton M45 coupler (ebay), thin gasket maker (loctite or Hylomar)

1. Airbox out
2. Silencer box (above SC) out, together with recirc flap (complete disassembly and cleaning is a good idea)
3. Belt off
4. Torx for the lower radiator hose off
5. Hose to coolant reservoir off
6. Clamp to the intercooler hose open and hose off
7. 6 bolts to the supercharger outlet off (21 Nm)
8. outlet removal
9. 6 bolts for the charger off (21 Nm)
10. charger removal
11. remove the bolts to the snout cover (14 Nm)
12. take off, oil comes out
13. change coupler
14. clean surfaces and very thin layer of gasket maker
15. fill in 110 ml oil and close cover again, bolts in cross pattern
16. all in again

Do it on a weekend, in general not a difficult work.