the oil i drained was fine - no milky residue

As it was mt first home service, i wanted to check there was no leak from the oil filter. Thats when i saw the residue... And i think my dad accidently put a bit too much oil abt 4.5L instead of the 4L. (oil id over max hole on dip stick by abt 10mm).

I'll wipe the residue of the filter for now and see how i do...

Also, when i drained my coolant, i went out for a drive afterward and saw my reserve resevvior low to a top it up - this meant i used up all 5L - but i read in the user manual it only needed 4.5L - would this be part of the issue as well?