This dont have anything to do with our bikes but here goes nothin. I have a Yamaha ATV that i got new in 07 and now only have about 20 hrs on so far and i have had syn oil in it from the start. I only use this thing during hunting time only and have changed the oil every year just because. Should i just use reg dino oil in this thing instead of syn as i dont ever run this thing in the summer time? I will probably be flamed for this but thats ok, I can take it.