US benchmark West Texas Intermediate (WTI) for delivery in June was down two cents at USD 47.70 a barrel.
Brent North Sea for July delivery dropped 30 cents to USD 48.67 compared with Monday's close.
Brent had yesterday reached USD 49.47 a barrel -- the highest point since early November. WTI struck USD 48.42, a peak since mid-October, before profit-taking set in.
"A break above USD 50 in the next few days is very possible," said BMI Research oil and gas analyst Peter Lee.
Prices are winning support from supply disruptions caused by wildfires in major crude producer Canada, as well as owing to armed attacks against oil facilities in Nigeria.
Wildfires burning around the oil sands hub of Fort McMurray in Alberta, Canada, have been rapidly moving north, forcing firefighters to shift their efforts to protecting existing oil facilities.
In Nigeria, Africa's biggest crude producer, troops have made several arrests following the attacks on an offshore oil facility as the government yesterday moved to avert a labour strike over petrol prices.
A report by US banking giant Goldman Sachs has meanwhile predicted a short-term supply deficit owing also to production outages in Venezuela, which is deep in political crisis.
Oil prices have rebounded strongly since plunging to near 13-year lows below USD 30 in February but are still well below peaks of more than USD 100 a barrel reached in June 2014.
Some analysts however said the disruptions are temporary and noted that the market remains oversupplied.
"However, prices could quickly drop back again once at least some of this supply comes back on stream. In the meantime, global stocks remain ample.
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