* Exxon, Chevron boost S&P 500 and Dow; tech weighs on Nasdaq
* Oil prices jump after OPEC agrees to modest hike in supply
* Red Hat slumps on disappointing revenue forecast
* Dow up 0.69 pct, S&P 500 up 0.40 pct, Nasdaq down 0.13 pct (Updates to mid-afternoon, changes byline)
By Chuck Mikolajczak
NEW YORK, June 22 (Reuters) - The S&P 500 and Dow Jones Industrial Average advanced on Friday, with the Dow poised to end an eight-day losing streak, as a jump in oil prices lifted energy stocks, but losses in technology stocks kept the Nasdaq in check.
U.S. crude rose 4.68 percent to $68.61 per barrel and Brent was last at $75.37, up 3.18 percent after oil producers agreed to modest crude output increases to compensate for losses in production at a time of rising global demand.
Exxon Mobil rose 2.2 percent and Chevron gained 2.3 percent, as the two biggest boosts to the S&P. The S&P energy index was up 2.4 percent, putting the sector on track for its best day in June.
A rally in oil prices due to an earlier OPEC decision to restrict supply in an effort to drain global inventories has given the sector a gain of more than 7 percent over the past three months, best among the eleven major S&P groups.
"A lot of people feel this market is oversold. Investors have been focused on the tariffs," said Jake Dollarhide, chief executive officer of Longbow Asset Management in Tulsa, Oklahoma.
The Dow Jones Industrial Average rose 168.5 points, or 0.69 percent, to 24,630.2, the S&P 500 gained 11.12 points, or 0.40 percent, to 2,760.88 and the Nasdaq Composite dropped 10.24 points, or 0.13 percent, to 7,702.71.
Trade worries still loomed, however, as U.S. President Donald Trump, in his latest move, threatened to impose a 20 percent tariff on all European Union car imports. The announcement came a month after the administration launched a probe into whether auto imports pose a threat to national security.
Harley-Davidson fell 2.1 percent. The U.S. bike maker has in the past warned of a "significant impact" on its sales if the European Union decides to increase duties on motorcycles in retaliation. The S&P autos & components index dipped 0.2 percent.
This adds to worries about the China-U.S. trade spat which escalated earlier this week after Trump threatened to impose tariffs on $200 billion of Chinese imports and Beijing vowed to retaliate.
Leading the decliners among tech was open source software provider Red Hat Inc, which tumbled 12.4 percent after its current-quarter and full-year revenue missed analysts' estimates due to a strengthening dollar.
Microsoft's 0.91 percent decline and Nvidia's 2.15 percent fall also weighed.
The trade spat has pushed the Dow Jones index lower for the past eight sessions as big industrial companies such as Boeing and Caterpillar have weighed on the index and put it on pace for its worst weekly performance in 13 weeks.
Friday is expected to see a surge of volume into the close ahead of FTSE Russell's final reconstitution of its indexes after the market close, likely to result in the biggest trading day of the year. nL1N1TM0SS]
Advancing issues outnumbered declining ones on the NYSE by a 1.87-to-1 ratio; on Nasdaq, a 1.15-to-1 ratio favored decliners.
The S&P 500 posted 17 new 52-week highs and 2 new lows; the Nasdaq Composite recorded 80 new highs and 36 new lows. (Additional reporting by Sinead Carew Editing by Chizu Nomiyama)