I have filled 6.4 liter, and checked again carefully.
To make sure, I have now lifted the one side of the car with a jack, and used a spirit level to make sure the car is level.
This has raised the level a bit, and would indicate that the level is about a quarter of a liter too much.
I will not bother with that, but the best figures I can come up with is thus:
6.2 liter with oil filter change.
5.7 liter without.
(assuming the filter holds 0.5 liter)
Sounds about right, not sure whether my car was totally level.
I just buy 6 liters nowadays and put it all in.
Filter I believe is slightly less than 0.5 liters but all within the margin I'd say