Oil extends gains, euro recovers on ECB assurances

Oil prices extended their gains on Friday at the end of a volatile week for the commodity, while the euro held its own after the European Central Bank made assurances that Greek banks would have access to much-needed funds. Investors seemed to shrug off a clash between Greece's new finance minister and his German counterpart over renegotiating Athens' debt, while a strong rally on Wall Street provided some support to regional markets. While the Greek issue is still in focus, attention