Brent crude futures fell 52 cents, or 0.75%, to $68.69 a barrel by 0325 GMT. U.S. West Texas Intermediate crude was at $66.69 a barrel, down 51 cents, or 0.76%. Both benchmarks settled slightly lower on Monday.
The August WTI contract expires on Tuesday and the more active September contract was down 54 cents, or 0.82%, to $65.41 a barrel.
Supply concerns have largely been alleviated by major producers raising output and since a ceasefire on June 24 ended the conflict between Israel and Iran. However, investors are increasingly worried about the global economy amid U.S. trade policy changes.
A weaker U.S. dollar has provided some backing for crude as buyers using other currencies are paying relatively less.
The EU is exploring a broader set of possible counter-measures against the United States as prospects for an acceptable trade agreement with Washington fade, according to EU diplomats. The U.S. has threatened to impose a 30% tariff on EU imports on August 1 if a deal is not reached.
There are also signs that rising oil supply has entered the market as the Organization of the Petroleum Exporting Countries and their allies unwind output cuts.
Saudi Arabia’s crude oil exports in May rose to their highest in three months, data from the Joint Organizations Data Initiative (JODI) showed on Monday. Reuters