5w40 fully synthetic is the recommended stuff, although you can use 0w40 or 10w40 if you can't find any.
Any brand is fine but I'd avoid the cheapo Halfrauds stuff.
Plus it takes 5.1 litres to fill the car. If the oil is at the bottom mark on the dipstick it takes exactly one litre to get it up to the top mark. Chances are you only need one litre so getting a 2 litre bottle will see you right.
If you can get hold of the Titan Fuchs range - go for that. I've used it with no issues. Oh an 5w 40 fully syn is what you need.
Assume you left the car atleast 10 mins after stopping the engine before you checked the oil?
Last time I went into Renault for their Elf Evolution 5w40 oil they didn't stock it anymore and had the Elf Evolution 5w30 instead.
It's a fuel efficient one rather than a performance oil allegedly
and the wrong grade for the car, DO NOT USE!