The price of oil has risen above $95 a barrel, supported by gains on global stock markets.
By midday in New York, benchmark oil for July delivery was up $1.24 to $95.40 a barrel.
The contract fell 10 cents on Friday. Monday was a holiday in the US.
Today's rise was set to break a four-day streak of losses for oil prices on the New York Mercantile Exchange.
Positive signs for the US economy helped.
US home prices rose the most in seven years and consumer confidence reached a five-year high.
US stock markets posted increases of more than 1% by midday. European and Asian markets closed higher earlier.
Oil's gains could be fleeting if recent concerns about demand resurface.
China, which has seen a decline in manufacturing activity, releases data on factory production later this week.
In the US, demand for gasoline has been weaker compared with last year and bad weather in some regions over the Memorial Day weekend may have kept drivers closer to home, wrote Phil Flynn, senior market analyst at The PRICE Futures Group, in a daily newsletter.
Brent crude, a benchmark for many international oil varieties, was up $1.70 to $104.35 a barrel on the ICE Futures exchange in London.
