Unique Motors

Hi I've got a clk55 w209 bit confused, I've got a dipstick but I just want to know the correct reading to check on the dipstick that it's at the max oil fill can I attach a picture. Also I think there's a bit of confusion to what I've been looking on the net as regards to the correct amount of oil the clk55 should have various between 8/5 l and 9/5 l which is big difference.