Brent crude futures were down 79 cents at $74.25 a barrel by 1043 GMT, while US futures fell 53 cents to $64.78 a barrel
Data on Wednesday showing a large build in US inventories fostered fears about the outlook for fuel demand
Brent crude futures, the international benchmark for oil prices, were at $63.27 a barrel, down 34 cents, or 0.5%
Brent crude was down 50 cents at $46.38 a barrel and US crude was 50 cents lower at $43.90