CNBC | Oil prices fall as US shale output and crude stockpiles are seen rising CNBC Oil prices fell on Tuesday following evidence of higher U.S. oil production and increasing U.S. crude inventories, but reports of a fall in Iranian oil exports helped to limit losses. Brent crude was down 42 cents a barrel at $80.36 by 8:26 a.m. ET ... Oil falls on US shale output, expected stocks data Saudi Arabia threat risks rare crack in US oil alliance Oil steadies as Saudi tensions balance demand outlook |