At 17.00 GMT, US benchmark West Texas Intermediate for October delivery shed USD 1.24 to USD 43.47 per barrel.
Brent North Sea crude for November delivery lost USD 1.19 to USD 45.70 a barrel compared with yesterday's close.
"There has been a lot of momentum selling from yesterday, which I would now expect to ease as the dollar is coming under a bit of pressure and oil prices are nearing key technical levels," Forex.Com analyst Fawad Razaqzada told AFP.
The market had already plunged yesterday after the US Department of Energy (DoE) said commercial inventories in the world's top consumer last week rose to 525.9 million barrels - and were now 16 percent higher than the same period last year.
The figures, which came despite a dip in production, poured fresh fuel on fears about a global supply glut that has dogged the crude market for several years.
Output was down slightly at 8.49 million barrels per day, a drop of 60,000 barrels per day on last week.
"US crude stockpiles have risen while OPEC heavyweights such as Saudi Arabia and Iraq continue to pump incessantly into a market that is already heavily saturated," said analyst Lukman Otunuga at trading firm FXTM.
"Persistent concerns over the excessive oversupply of oil in the global markets (have) haunted investor attraction towards the commodity.
"It is becoming increasingly clear that investors have digested the oversupply reality with the fading optimism over OPEC securing a freeze deal in September's informal meeting enticing sellers to attack further."
Prices had soared last month as OPEC and Russia agreed to hold talks to address the supply crisis.
Analysts remain doubtful oil producers will agree to any limits at the meeting in Algeria this month.
"WTI crude remains fundamentally bearish with further declines expected as the combination of supply fears and soft demand encourages bears to install rounds of selling," added Otunuga.
Disclaimer: No Business Standard Journalist was involved in creation of this content
