There is no dipstick for the 211, just a cap. At the shop, we use a MB special tool they call out for. It is our universal granulated measuring stick and reads in MM for level.
This thing is around $140 and is PN # 120 589 07 21 00
There are min and max values in MM. for the oil level of all new MB's.
I think the topsider works on these, just make sure you are on the engine tube and not the trans tube.