Just to close off this thread the oil capacity of my T6.1 (DNA engine code) I think is 7 litres, which brings the oil level half way up the cross hatched mark on the dip stick with the engine up to operating temp. (Which was at the same level when supplied new from the factory).
But 7.25 litres brings the level almost to the top which I have done, so it's easier to keep an eye on.