OPEC oil output fell for a fourth straight month in April, a Reuters survey found on Tuesday, as top exporter Saudi Arabia kept production below its target while maintenance and unrest cut production in exempt nations Nigeria and Libya. But more oil from Angola and higher UAE output than originally thought helped OPEC compliance with its production-cutting deal slip to 90 percent from a revised 92 percent in March, according to Reuters surveys. The Organization of the Petroleum Exporting Countries pledged to reduce output by about 1.2 million barrels per day (bpd) for six months from Jan. 1 - the first supply cut deal since 2008. 

Non-OPEC producers are cutting about half as much. OPEC wants to get rid of excess supply that is keeping oil below $52 a barrel, half the level of mid-2014. With the oversupply proving hard to shift, OPEC is expected to prolong the agreement.

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