anything you like, mate. I've been all over africa, australia, russia and the middle east on them. I've had to use oil for diesel engines, SAE 40, 20W50, 0W50 synthetic. I also used 80 octane rubbish and the worst effect has been a bit of smoke. no pinking, just black smoke and a bit of glaze in the carb.
together with two mates, we've done 120-150,000km on BRPs and they're tougher than all of us ... one of them got water in his enigne, changed the oil and set off across australia.
let me know if you manage to blow yours up or wear it out cos honda built 'em to outlast all of us
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