Saudi, Russia pledge output cuts ahead of OPEC meeting
OPEC unlikely to tweak overall oil output policy
U.S. to ensure energy market promotes growth
U.S. nonfarm payroll data in focus

SINGAPORE, Aug 4 Reuters Oil prices rose for a second day on Friday, set for their sixth week of gains, after Saudi Arabia and Russia, the world39;s second and thirdlargest crude producers, pledged to cut output through next month.

Brent crude futures for October rose 2 cents to 85.16 a barrel by 0609 GMT, while U.S. West Texas Intermediate crude for September rose 9 cents, or 0.1, to 81.64.

Both benchmarks were on track for a sixth week of gains, their longest streak of weekly gains this year. Brent has risen 15.4 and WTI by 18.2 during the last six weeks.

Saudi Arabia on Thursday extended a voluntary oil production cut of 1 million barrels per day bpd to the end of September. Russia will also slash its oil exports by 300,000 bpd in September, its Deputy Prime Minister Alexander Novak said.

The Joint Ministerial Monitoring Committee of OPEC is unlikely to tweak its overall oil output cuts at its meeting on Friday, sources have said. But the extension of Saudi Arabia39;s reductions and comments by Russia ahead of the OPEC meeting have raised supply concerns, supporting prices.

However, the latest batch of U.S. data showing tight labor markets and a slowing service sector has triggered some worries that an economic slowdown would curb demand for oil and pressure prices lower, even…