World oil prices went into reverse this evening after weaker than expected US economic growth data overshadowed the impact of a rescue plan for Greece.
US crude dipped 71 cents to $79.82 a barrel, while London's Brent crude slid 56 cents to $79.05.
Earlier, data showed that the US economy - the top global oil consumer - grew at a slower pace than previously thought in the fourth quarter.
In earlier trade this morning, oil was boosted by an EU agreement overnight to help Greece reduce its massive debt mountain.
