Oil traded above $85 a barrel and near a four-year high on Wednesday, supported by expectations that U.S. sanctions on Iran will tighten supply and strain the ability of Saudi Arabia and other producers to pump more.  Crude exports from Iran, OPEC’s third-largest producer, are already falling as the U.S. sanctions kicking in on Nov. 4 deter buyers. The drop in exports is reducing the impact of an OPEC production increase agreed in June. [OPEC/O] Brent crude LCOc1, the global benchmark, was up 38 cents at $85.18 a barrel at 0833 GMT. It reached $85.45 on Monday, its highest level since November 2014. U.S. crude CLc1 was up 24 cents at $75.47. With Iranian exports expected to fall further, analysts say […]