The recent rally in Brent Crude prices to four year highs resulted in the Middle East sour crude grades also jumping to the highest in four years amid very active trade in the first two days of October, market sources told Platts on Tuesday. Brent Crude prices hit $85 a barrel on Monday, amid signs that OPEC and friends are not able or not yet willing to fully compensate for the already noticeable drop in Iran’s oil exports. At 09:30 a.m. EDT on Tuesday, Brent Crude was slightly down 0.08 percent at $84.91, while WTI Crude was slightly up…