U.S. West Texas Intermediate was at $40.01 a barrel, down 13 cents or 0.3%, following a 2.1% decline last week.
Brent crude edged down 8 cents, or 0.2%, to $41.84 a barrel by 0003 GMT after dropping 2.9% last week.
Brent is on track to fall for the first month in six while WTI is headed for its first monthly loss since April as renewed mobility curbs in various countries following more coronavirus cases cloud the outlook on fuel demand recovery.
“New COVID-19 case numbers are accelerating in major U.S. states, renewing fears of mobility restrictions challenging the ongoing oil demand recovery in the last quarter,” ANZ analysts said in a note.
More crude is also being exported from OPEC producers Iran and Libya despite efforts by the Organization of the Petroleum Exporting Countries and their allies to limit output.
Still, OPEC Secretary General Mohammad Barkindo said on Sunday that commercial oil inventories in OECD countries are expected to stand only slightly above the five-year average in the first quarter of 2021, before falling below that level for the rest of the year.
In Norway, one of the largest oil producers outside OPEC, a workers’ strike which may take place on Sept. 30 is threatening to cut Norway’s production by 900,000 barrels per day, the Norwegian Oil and Gas Association (NOG) said on Friday.
Also, one of the heaviest clashes between Armenia and Azerbaijan since 2016 broke out over weekend, reigniting concern about stability in the South Caucasus, a corridor for pipelines carrying oil and gas to world markets.29dk2902l