My old Volvo V40's used to have an electronic oil gauge and no dipstick.
I drained the oil overnight, filled it up with 5 litres (I think the capacity was 5.2 litres) and then added 100ml a day until I got an 'overfilled' warning. I then subtracted the last 100ml from the total oil installed and added that at every oil change.
My 2020 BMW 5 Series had an electronic dipstick, but there was also a manual dipstick hidden down the back of the engine.
I drained the oil overnight, filled it up with 5 litres (I think the capacity was 5.2 litres) and then added 100ml a day until I got an 'overfilled' warning. I then subtracted the last 100ml from the total oil installed and added that at every oil change.
My 2020 BMW 5 Series had an electronic dipstick, but there was also a manual dipstick hidden down the back of the engine.