I recently had some transmission oil leak out and I need to top it up again (my car refuses to go into gear now that the oil is low). I got a dipstick to check the level, but it’s a generic one so it’s not clear what level the oil needs to be at.

From what I understand it’s supposed to be a “lifetime” system and isn’t meant to be changed, so I can’t find a lot of info out there about it. The closest I saw was a video of someone changing their oil on a W176 A45 (I have a W177 A35) and that person’s transmission oil was at the 4th notch on the dipstick that looks the same as mine (as indicated by a MB Star unit).

Does anyone know where I can find some info on where the transmission oil level should be? Thanks in advance.