You'll need an 8mm (3/8" old money) square drive fella, its a cooount to get out too so be careful you don't skin your knuckles.
As long as your dipstick reads correct levels then 4.9L is fine as some will reside in the filter itself. Remember for your dipstick oyu need to be on level ground, and also your engine shouldn't be warm as expansion won't give you an accurate reading. You can also press in the trip reset button when your car is displaying 'OIL OK' to get a metered reading:
000000 - full
------ - empty.
And remember to take off the sump guard totally, otherwise the oil drips onto the sump tray and then leaves all over your drive for months after, i know from experience lol