Crude oil fell about 2 per cent on Friday, the first decline after three days of gains, as worries over the Greek fiscal crisis, weaker oil products prices and pre-weekend profit taking undercut the market.

Gasoline and diesel's proxy, heating oil, led the oil complex lower, sliding more than 2 per cent as concerns about their high refining margins over crude prompted those who had been bullish on such products to close out some positions.

A slowdown in the decline of US oil rigs did not help. Oil services firm Baker Hughes reported an overall drop of four US rigs this week, compared to 7 last week. It also cited new drilling activity in the Permian and Bakken shale basins, a sign that higher crude prices were coaxing producers back to the well pad after a six-month price rout.

Brent crude fell $1.24, or 1.9 per cent, to settle down for the first time since Monday at $63.02 a barrel.

US crude slipped 84 cents, or 1.4 per cent, to $59.61.

For the week, Brent fell 1.3 per cent, and US crude half a per cent.

Traders said the decline was mostly on fears about Greece, which teetered on the edge of default.

Euro zone leaders will hold an emergency summit on Monday to try and throw a lifeline to Athens. While the crisis has affected equity and treasury markets more than oil, the dollar's resultant rise has made commodities denominated in the greenback costlier for users of currencies like the euro.

Greece's neighbours, meanwhile, are expected to contribute to much of euro zone oil demand this year, and "if there was a Greek default and a contagion of a risk premium to other southern European countries, it could have a negative impact on European oil demand," said Olivier Jakob at Petromatrix in Zug, Switzerland.

Profit-taking in oil products also weighed on crude, said Donald Morton, who runs an energy trading desk at Herbert J. Sims & Co in Fairfield, Connecticut.

"The gasoline crack is still very high," Morton said, referring to the profit refiners obtain for "cracking" the motor fuel out of crude. "There is still a large speculator position in my opinion in gasoline."

The gasoline crack stood at above $26 a barrel on Friday, off Wednesday's 3-month high above $30 hit in anticipation of peak summer driving demand. For heating oil, or diesel, the crack was above $19, a level broadly sustained this month. – Reuters