Brent crude oil futures were up 11 cents, or 0.1%, at $107.13 a barrel 0102 GMT, adding a 2.3% gain on Friday.
U.S. WTI crude futures, however, slid 15 cents, or 0.1%, to $104.64 a barrel, paring a 2% gain from Friday.
Trading was reduced on a holiday in parts of Southeast Asia.
Both contracts posted weekly declines last week as the market was dominated by fears that raising interest rates to curb inflation could trigger a recession and dent demand for oil.
“Net long positions in WTI crude futures are now their lowest level since March 2020, when demand collapsed amid the initial outbreak of COVID-19. This despite continued signs of tightening” , said analysts at ANZ Research in a statement.
Both benchmark contracts traded lower in early trading on Monday, then turned positive before moving in different directions.
The latest data on COVID-19 cases in China showed numbers had fallen from the previous day, but concerns remain about the possibility of a wider lockdown following the discovery of a new Omicron Shanghai subvariant.
On the supply side, the market remains nervous over plans by Western nations to cap Russian oil prices, with President Vladimir Putin warning that further sanctions could have “catastrophic” consequences for the global energy market.
Questions also remain about how long it will take crude from Kazakhstan through the Caspian Pipeline Consortium (CPC). Supply has continued so far on the pipeline, which carries around 1% of the world’s oil, even after a Russian court last week ordered it to suspend operations.
CPC blended crude oil exports are expected to rise to 5.45 million tonnes for August from 4.86 million tonnes in July, according to a loading schedule.