Brent were up 23 cents, or 0.28%, at $83.56 per barrel , WTI rose 24 cents, or 0.31%, to $78.72 a barrel.

Differentials for the flagship Arab Light grade were priced at Platts Dubai/DME Oman +$2.90 per barrel, up from +$2 a barrel in April.

Brent climbed 28 cents, or 0.3%, to $83.24 a barrel , WTI were at $78.40 a barrel, up 29 cents, or 0.4%.

Brent rose 16 cents to $83.83 a barrel, WTI rwas up 19 cents to $79.14 per barrel.

Brent gained 31 cents, or 0.4%, to $89.32 a barrel, WTI rose by 23 cents, or 0.3%, to $83.80 a barrel.

Worries include uncertainty over remaining Russian flows through Ukraine and rebounding gas demand in Asia. A colder-than-normal winter spurring consumption at home is also seen as more likely after two consecutive mild ones.

The capacity for transmitting electricity to Belgium, Germany, Switzerland and Italy has been reduced since early March, according to French power-grid operator RTE. That’s depriving those nations of exports of cheaper French nuclear power and boosting wholesale prices across the region.

Brent traded 27 cents higher at $87.27 a barrel, WTI gained 26 cents to $82.16 a barrel.

The data indicated that the Kingdom’s crude exports rose to 6.32 million bpd, reflecting a monthly increase of 0.32 percent.

Brent slipped 56 cents, or 0.62%, to $89.46 a barrel, WTI fell 63 cents, or 0.74%, to $84.73 a barrel.