(John Kemp is a Reuters market analyst. Oil producers may be struggling as a result of low prices but the oil storage business has never been in better shape. U.S. refiners, traders and logistics ...

June 27 (Reuters) - All U.S. crude that is processed by a distillation tower, not only light oil known as condensate, is exempt from the 40-year crude export ban, U.S. government and industry sources ...