By Christopher Johnson
Brent crude was up 40 cents at $81.81 a barrel by 0755 GMT, after gaining $1.15 in the previous three sessions. The global benchmark, which hit a two-week low last week as equity markets dropped, is trading around $5 below a four-year high of $86.74 reached on Oct. 3.
U.S. light crude oil was up 30 cents at $72.22.
"Numbers from the American Petroleum Institute surprised the market (on Tuesday), with U.S. crude oil inventories declining by 2.13 million barrels over the last week, compared to expectations of a stock build," said ING commodities strategist Warren Patterson.
A Reuters survey ahead of the API data had estimated crude stocks rose about 2.2 million barrels.
U.S. gasoline stocks dropped by a larger-than-expected 3.4 million barrels, while distillate fuel stockpiles declined by a smaller-than-expected 246,000 barrels, the API data showed.
Inventory data from the U.S. Energy Department's Energy Information Administration is due at 1430 GMT on Wednesday.
Also underpinning sentiment is the scandal over the disappearance of prominent Saudi critic and journalist Jamal Khashoggi, who disappeared two weeks ago after entering the Saudi consulate in Istanbul.
U.S. President Donald Trump gave Saudi Arabia the benefit of the doubt in the case even as U.S. lawmakers pointed the finger at the Saudi leadership and Western pressure mounted on Riyadh to provide answers.
Saudi Arabia has said it will conduct an investigation into the disappearance, U.S. Secretary of State Mike Pompeo said before departing the kingdom for Turkey.
Investors are concerned that Saudi Arabia could use oil supply to retaliate against its critics.
Jim Ritterbusch, president of Ritterbusch and Associates, said Saudi Arabia could cut as much as 500,000 barrels per day of crude production "as a warning shot should the U.S. opt to impose any type of sanction in response to the Khashoggi developments".
A claim by the United States that it aims to reduce Iran's oil exports to zero is a "political bluff", the head of the state-run National Iranian Oil Company was quoted as saying on Wednesday.
New U.S. sanctions on Iranian oil exports start on Nov. 4, while Iran has accused Saudi Arabia and Russia of breaking an OPEC-led agreement on output cuts by producing more crude.
(Reporting by Christopher Johnson in LONDON and Osamu Tsukimori in TOKYO; Editing by Jason Neely and Edmund Blair)
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)