The gains extended a slight recovery yesterday after they were hammered Wednesday by data showing US crude stockpiles increased much more than expected last week, adding to worries about a global glut.
Prices have been depressed for more than a year by global oversupply and a slowdown in major economies, particularly China, the world's top energy consumer.
US benchmark West Texas Intermediate for delivery in December was up 22 cents to USD 45.57 and Brent crude for December gained 27 cents to USD 48.35 at around 0330 GMT.
Ang said, however, he expected the US and European purchasing managers indexes on manufacturing activity -- closely watched measures of the health of the industrial sector -- to show weakness.
"The data will likely put a more bearish tone on oil prices," he told AFP, citing the European Central Bank's hints yesterday that it could ramp up its bond-buying stimulus programme at its December policy meeting.