US West Texas Intermediate (WTI) crude futures dropped 40 cents, or 1.0%, to $40.72 a barrel by 0118 GMT, having lost 0.8% on Thursday. Brent crude was down 36 cents, or 0.8%, at $43.17 a barrel, after dropping 0.6% on Thursday.
Read MoreConsumption of fuel, a proxy for oil demand, totalled 17.78 million tonnes, data from the Petroleum Planning and Analysis Cell (PPAC) of the oil ministry showed.
Read MoreBrent crude fell 0.8% to $43.46 a barrel in early London trade, snapping three straight days of gains.
Read MoreU.S. West Texas Intermediate (WTI) crude futures fell 55 cents, or almost 1.4%, to $39.74 a barrel by 0545 GMT, while Brent crude futures fell 44 cents, or 1%, to $41.96.
Read MoreOPEC+ agreed to cut supply by 7.7 million barrels per day from August through December and then ease the cut to 5.7 million bpd from January.
Read MoreBrent crude had climbed 91 cents, or 2.3%, to $40.36 a barrel by 0946 GMT, while U.S. West Texas Intermediate crude was at $38.04, up 90 cents, or 2.4%.
Read MoreWest Texas Intermediate was down $1.06, or 2.7%, at $37.73 a barrel at 0538 GMT, after dropping 0.9% on Thursday. Brent crude was off $1.05, or 2.6%, at $39.88, having fallen 0.7% in the previous session.
Read MoreBrent crude was off 72 cents, or 1.8%, at $40.21, having fallen 0.7% in the previous session. Still, the contracts are heading for their first weekly gain in four.
Read MoreBrent crude fell 33 cents, or 0.8%, to $40.90 a barrel by 0927 GMT and U.S. West Texas Intermediate (WTI) crude was down 39 cents, or 1%, at $38.76. Both contracts had jumped around 4% on Wednesday.
Read MoreUS West Texas Intermediate (WTI) crude futures fell 40 cents, or 1%, to $38.75 a barrel at 0141 GMT, while Brent crude futures dropped 41 cents, or 1%, to $40.82 a barrel.
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