4 litres as a top up is far too much.....

the distance from the low oil & full oil mark on the dipstick is appx 1 litre.
that being said, if it took 4 litres before it appeared onto the dipstick while it was sat on a flat level surface I would be worried......
However, if you have done an oil change 4 litres is in the right region....
Can you be a bit more specific as to why you have put 4 litres in, i.e. as a top up, or as an oil change,