Julien. Welcome to the forum and I'm sure 1560 and spudgun will look after you.
Sorry to hear your having issues with your can and hope you get them resolved soon.
Roberts spot on with the oil information and it isn't obvious where the oil goes. I just hope it doesn't need topping up to often.
The filler cap is partly hidden under the right hand side wing (if your sitting in the car). The photo shows the wing vent. Good luck with topping it up and if anyone knows how please let us all know.