Would an end to the war lead to cheaper oil prices?
The only real source of oil globally that has any potential of suddenly coming onto world oil markets is Iraqi oil. At this point, its still a long shot that this would happen (too much fighting still on the ground, and too much political instablity), but if you look at countries like Nigeria where there is rebel fighting in the Niger river delta, you can clearly see that total peace is not necessarily a requirement for oil extraction, and its likely that oil will flow more seriously out of Iraq well before a full and final peace is achieved.