Turkey is a strategic conduit for shipments from Russia and Iraq to the Mediterranean and there had been fears that the bid to grab power by a military faction at the weekend would disrupt flows.
The coup, however, was quickly crushed.
At around 0340 GMT, US benchmark West Texas Intermediate fell 18 cents, or 0.40 per cent, to USD 45.06 and Brent fell 14 cents, or 0.30 per cent, to USD 46.82.
After topping USD 50 in early June on the back of unrest in key African producer Nigeria and wildfires in Canada's key crude region, prices have been falling as the crises eased.
No shipments have been stopped since large tankers were barred from sailing in the Bosphorus waterway near Istanbul for several hours on Saturday, Bloomberg News reported, quoting a port agent.
Analysts said however that downside risks for prices remain.
"Global inventories remain very high, and the potential impact of growing Iranian exports, Saudi-Iranian competition for market share and weaker global economic growth are some of the factors that could cause oil prices to slip from their current level," Moody's Investors Service said in a note.
Output from the Organization of the Petroleum Exporting Countries climbed 300,000 barrels per day in June, close to an eight-year high of 32.73 million, according to Energy information provider S&P Global Platts.
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