U.S. crude prices ended the month nearly 8 percent higher, supported in the final week of September by planned OPEC output cuts, but profit-taking after a two-day rally capped gains for benchmark crude on Friday.
On a weekly basis, WTI had climbed about 8.5 percent, while Brent was up nearly 7 percent from last Friday's close. For the third quarter, U.S. crude was roughly flat.
Also on Friday, the U.S. oil rig count rose by 7 to a total of 425, marking the 13th time in the last 14 weeks the tally has ticked up, oilfield services firm Baker Hughes reported. At this time last year, U.S. drillers were operating 614 oil rigs.
U.S. drillers in the third quarter added 95 oil rigs, the greatest increase in any quarter since 2014, but the pace of additions has slowed as crude holds below $50 a barrel despite OPEC's first plan in eight years to cut output.