Hi I recently bought a FPV Force 6 wondering if anyone is using royal purple in there FPV or XR6T...I have always used Royal Purple 10w40 in my old VX SS but im new to the ford turbo engine and im unsure what oil to use it states in the service manual to use 15w40 so I am assuming that would be the best oil to use as royal purple make that oil...Dose anyone use that type of oil in there car, How do you find it, my car isnt a daily driver and has no modifcations at the moment...it also dosnt get flogged lucky if it hits boost once or twice in a week