5W-40 is the correct grade. Buy the Selenia multiair oil, its easy to get hold of on the net.
The service light will show on your dash at 9k and you will need an oil change then anyway.
Buy two 2 litre tins of Selenia 5w-40 multiair oil, from the net. Use some for the oil change and you will have half litre or so for top top up. Just get a price for labour for doing the oil change.
kEVO