Oil declined Friday but still posted a weekly gain as traders weighed the prospects of higher demand this winter against the potential for Iranian supply to return.
West Texas Intermediate futures ended the week 3.5% higher after losing 2.4% Friday. Iran said it could accept a European Union-brokered nuclear deal if it receives certain guarantees. The prospect of more oil supply wiped out all gains earlier in the session.
Crude has been whipsawed by a flurry of both bearish and bullish hea ....
