Broke in my raptor 700 with mineral oil (like recommended by mototuneusa.com) and changed over Castrol R4 superbike 5W40, i use this oil on all of my 4-stroke engines (beside the raptor i have 5 lawnequipent motors running).
However i prefer a Yamaha quad, must say that Honda is the superb engine-builer ever, have a 2 cil/22 hp lawnmower, believe me or not, after running 60 hrs with this oil, even the color of the oil (red) had not changed. Never seen that before!!
This oil is perfect for wet-clutch machines like our Raptor's and is very resistant against extreme temperatures.
No need to say that this topic can go on for ever; whenever you are within specs and satisfied with performance be happy
But for me, Castrol :thumbsup: