Same as Mr Diver, I never measure how much I put in after a change. Just fill slowly after about 2L until it's about right. Then run the engine for a minute or two. If you've changed the oil filter it will drop anyway (you can fill the oil filter a fair bit before putting it on first) then, after a few minutes to let it settle, just top up as necessary. The book says anywhere between the low & high mark is OK.