Oil prices started the new trading week on Monday with discounts.
A burden came from the rising US dollar, which made oil more expensive for investors outside the dollar zone.
In the morning, a barrel (159 liters) of North Sea Brent cost $106.02.
That was $1.12 less than Friday.
The price of a barrel of West Texas Intermediate (WTI) grade fell $1.02 to $103.67.
Oil prices have been hovering around the $100 mark for some time.
While the Brent price is mostly well above the mark, the WTI price is moving at a slightly lower level.
Compared to the beginning of the year, prices have risen by a good 35 percent, which is mainly due to the Ukraine war.
Even before the Russian invasion, crude oil prices had risen significantly.
The scarce supply, which is due in particular to severe sanctions against Russia, primarily by Western countries, is providing a general boost.
China's corona policy, on the other hand, is tending to have a negative impact, with strict containment measures causing economic strain and lower demand for crude oil.