FWIW, I only put oil in the car in this specific way. I'm figuring my guage has it's particular quirk like TPMS has it's particular quirk for each car.

In my garage I wait for the indicator to show it's down TWO bars. The moment it shows it's down two bars I add exactly 800 ml of oil (each bar supposedly is .4L).

Works for me... .

Try it when you change your oil. Add the last few quarts of oil slowly and then check what the guage sez. Mine said two bars needs 800 ml to appear full ***after I've added exactly the required nine quarts***. To make this accurate you must the trick of slowly and completely filling the oil filter "cup" before screwing it in.