I just changed the oil on all my quads, I usually run Castrol GTX. Walmart had the Vavoline 4T oil on sale in the clearance for like $4 each, I added it to my Honda and it was like a brand new machine, shifted great ran better and faster! I put Mobile 1 10W-30 in the blaster just regular motor oil, I figured just since I just got it, run oil thru a cycle to clean out any stuff that might be there. The manual recommends 10W30, any issues running 10W40 full synthetic? I was really impressed with the Valvoline and would like to add it to the quad, just want to get other opinions on this and good/bad experiences from other Blasty owners.