Mumbai, Aug. 11 -- Crude oil advanced toward $84 per barrel on Tuesday, extending its winning streak, as uncertainty surrounding a potential US-Iran agreement and the reopening of the Strait of Hormuz continued to underpin prices. Negotiations remain fraught with complications after the US imposed sweeping demands on Iran, while Tehran continues to seek reparations as part of efforts to end the conflict. The absence of an agreement between Iran and Oman to reopen the strategic waterway is adding to supply-side apprehensions, with Tehran linking any reopening to progress with Washington. Meanwhile, the dollar index held near 99.7 ahead of key US inflation readings, with markets awaiting fresh clues on the Federal Reserve's policy trajectory ...