Honda quad oil

[ellectrastar]

Looking to change the oil and filter on a Honda 420 quad for a pal. When I’ve checked online I see Honda’s GN4 oil recommended, but can’t seem to find any for sale unless I buy from abroad. Leads me to think this is probably American branding. What oil would I be best to use instead? It’s 10w-30 motor oil. So is this the same as oil you put in a car?? Or for a motorbike? So sorry for complete newbie question...