A sharp drop in crude oil prices have helped improved investor sentiment
OPEC, together with some non-OPEC producers including Russia started withholding output in 2017 to end a global supply overhang and prop up prices
The largest US refinery, Motiva Enterprises' 603,000 bpd Port Arthur facility in Texas, began a planned one-month overhaul on Monday of its key crude oil processing unit.
Brent crude, the international benchmark for oil prices, slipped 15 cents to $65.10 a barrel at 1153 GMT