I’ve recently bought a 2015 250excf and it said its been serviced but I’m keen to just do one to make sure. What oil would be recommended?

Was At the Putoline Oils Elite Sprint Enduro last weekend in the valley of wales, Cracking event there was some real close action for the spectators, it was awesome. Anyway heres the link For the film LINK= http://vimeo.com/6329769