Wow take it easy lads
It’s a top up of all fluids, and you don’t have to go specifically for it. I brought the e39 for a valet at Joe Duffy after the Scotland trip (you’re entitled to 1 a month) knowing it could use an oil top up, and picked it up later spotless with a 0.5 Litre oil top up and windscreen wash topped up too (not that it was the reason I went).
Edit: here are some photos (any excuse )