Crude prices edged up Friday on lack of progress in Iran nuclear talks and U.S. four-year high consumer confidence.

Talks between Teheran and six major powers fell into an impasse. Iran accused world powers of creating "a difficult atmosphere" that blocked progress of the talks, while the western countries insisted that Iran must give up the nuclear program before more sanctions were imposed. Tension over Iran tended to rise, which pushed the crude prices up.

U.S. upbeat data also helped bolster market sentiment. Despite the external economic threat from Europe and internal worries about a recovery slow-down, U.S. consumers remained optimistic. The Reuters/University of Michigan index jumped to 79.3 in May, up nearly 3 points from April and up 1.5 points from the mid-month reading. It was best reading in more than four years.

But lackluster news from Europe kept weighing and limited the crude gains. For Greece's problem, there was still no solution. Meanwhile, the euro zone countries were preparing for contingency plans to deal with Greece's exit the single currency. The whole Eruopean financial system remained fragile, and Spain's fourth largest bank Bankia's shares were suspended from trading as the bank was waiting for a government rescue details.

European economy also pointed to weakness, with the composite PMI indicating a weakening economy in core nations such as Germany and France.

Light, sweet crude for July delivery rose 20 cents, or 0.22 percent to settle at 90.86 dollars a barrel on the New York Mercantile Exchange. For this week, it dropped 62 cents, or 0.68 percent. In London, Brent crude for July delivery also rose slightly and last traded above 106 dollars a barrel.