That sets the OSP differential for Qatar Marine at 43 cents a barrel above Dubai quotes, 8 cents lower than a month ago.

Qatar also set its July Qatar Land crude OSP at $75.25 a barrel, down from $76.15 for the previous month.

The price cut was lower than traders' expectations, an industry source said.

"The market traded in teens discount, so it was a little less than expected," the source added.

Qatar Marine cargoes for loading in September last traded at a discount of about 10 to 15 cents a barrel to its official selling price, traders have said.

The following table shows the latest OSPs and their differentials to Dubai in brackets.