Brent slipped for a third day and was down 51 cents, 1.4%, at $37.14 a barrel, WTI declined 48 cents, or 1.3%, to $35.69 a barrel.

Brent were down $1.96, or 5%, at $37.16, WTI fell $1.94, or 5.2%, to $35.45.

Brent were down $1.20, or 2.9%, at $40 a barrel, WTI was down $1.49, or 3.7%, at $38.08.

Brent was up 52 cents, or 1.3%, at $40.98 a barrel, WTI gained 38 cents, or 1%, to $38.94.

Brent was down $1.08, or 2.6%, at $40.69 a barrel, WTI dropped $1.05, or 2.6%, to $38.80.

Saudi Energy Minister Prince Abdulaziz bin Salman, who has warned his counterparts of the market's shaky footing and the need to be proactive on production policy, could very well welcome any lobbying by the Trump administration, if global oil demand prospects do not improve.

Brent rose 20 cents, or 0.5%, to $42.66 a barrel, WTI added 15 cents, or 0.4%, to $40.79.

The average LNG price for December delivery into northeast Asia LNG-AS was estimated at about $6.90 per million British thermal units (mmBtu), jumping $1.10 from the previous week.

Brent were up 43 cents at $42.16 a barrel, WTI ticked up 44 cents to $40.47 a barrel.

Brent were at $42.44 a barrel, WTI slipped 73 cents, or 1.75%, to $40.97.