Oil prices were little changed in thin trade on Friday, with investors focusing on talks aimed at averting a Greek debt default. Brent crude for August delivery was up 19 cents at $63.39 a barrel by 0334 GMT (1134 EDT)after ending the previous session down 29 cents, or 0.5 percent. “Traders and investors are very much on tenterhooks on the outcome (of talks on Greece),” said Ben Le Brun, a market analyst at OptionsXpress in Sydney.