UPDATE 8-Oil down 3 pct as ample OPEC supply weighs

* OPEC compliance with supply curbs rises, but total output up

* Selling picks up on heavy volume

* Pernis refinery closure boosts refining margins

* Coming Up: API data on U.S. crude stocks 4:30 ET/2030 GMT (New throughout, updates prices, market activity and comments)

NEW YORK, Aug 1 (Reuters) - Oil slid about 3 percent from a two-month high on Tuesday as major world oil producers kept pumping out supply, worrying investors that several weeks of steady gains had pushed the rally too far, too fast.

Selling picked up in the late morning as oil broke below Monday's lows, and with more than 725,000 U.S. futures contracts traded by 12:17 p.m. EDT (1617 GMT), it was shaping up to be one of the busiest sessions in the last several weeks.

OPEC production rose in July, a Reuters survey found Monday, despite a deal to cut output. That prompted selling after U.S. oil futures had risen more than 16 percent since late June.

"It seems to be more technical and a combination of that and the OPEC story has everybody running for exits at the same time," said Phil Flynn, analyst at Price Futures Group in Chicago.

U.S. inventory reports due on Tuesday and Wednesday are expected to show crude stocks fell by 2.9 million barrels last week, the fifth straight week of declines.

Brent crude, the international benchmark, was down $1.55 a barrel, or 2.9 percent, to $51.18 at 12:17 p.m. EDT (1617 GMT). U.S. crude was down $1.53, or 3.1 percent, to $48.64 a barrel.

"Momentum indicators have us in overbought territory over the last few days, which is telling you (oil) is going to pull back somewhat," said Robert Yawger, director of energy futures at Mizuho Americas.

Gasoline and heating oil crack spreads <RBc1-CLc1> <HOc1-CLc1> were stronger on Tuesday after Royal Dutch Shell said its Pernis refinery in the Netherlands, Europe's largest oil refinery, will remain closed through mid-August following a fire.

Industry group the American Petroleum Institute (API) is due to report its data on U.S. inventories at 4:30 p.m. EDT (2030 GMT). The U.S. government's official data is out on Wednesday.

On the demand side, forecasters including the International Energy Agency have been raising their estimates. Oil company BP said Tuesday it sees demand growing by 1.4 to 1.5 million barrels per day (bpd).

The Organization of the Petroleum Exporting Countries, along with Russia and other non-members have agreed to reduce output by 1.8 million bpd from Jan. 1, 2017 until March next year to get rid of excess supply.

Oil output by OPEC rose last month by 90,000 bpd to a 2017 high, led by Libya, one of the exempt producers.

(Additional reporting by Alex Lawler and Henning Gloystein; Editing by Nick Zieminski and David Gregorio)