Updated from 7:57 a.m. EDTOil prices rose above $41 a barrel again Friday, as the Organization of Petroleum Exporting Countries' latest move to calm market supply worries had a short-lived impact. The benchmark U.S. crude added 64 cents, or 1.6%, to $41.60, less than a dollar shy of the record high set six weeks ago. Gasoline futures rose 1.5 cents, to $1.335 a gallon. Oil prices slipped Thursday after OPEC said it had decided to increase its production ceiling by half a million barrels a day in August and also cancelled a July 21 meeting on the issue. The measure was part of a broader agreement reached at OPEC's June 3 meeting, when it decided to increase official production by 2 million barrels a day in July. Prices touched a record high of more than $42 a barrel right before that meeting. The August increase will put OPEC's official production ceiling at 26 million barrels a day, although its members routinely produce more than their individual quotas. A recent International Energy Agency report said the cartel produced more than 28 million barrels a day in July, when its ceiling was just 23.5 million barrels a day. At one point recently, oil prices had fallen 15% from their record high, closing below $36 a barrel. Since then, prices have bounced back on worries about production levels in such major oil-producing countries as Iraq, Norway, Nigeria and Russia, as well as terror attacks in the U.S. ahead of the presidential election. During May, traders relentlessly bid up prices on short-term supply concerns triggered by strong global demand and terror attacks on oil industry personnel and facilities in the Persian Gulf region ahead of the peak summer driving season in the U.S. and Europe.