MarketWatch | Oil prices slip as China PMI weakens demand outlook MarketWatch Crude-oil futures fell in Asian trade Monday after China's official purchasing managers index showed modest gains in May, damping the demand outlook for one of the world's largest consumers. Traders booked profits as U.S. GDP data issued Friday showed ... Nigerian Oil Hurt by Tussle Between OPEC and US UPDATE 4-Oil prices fall as OPEC output stays high Oil Halts Advance as Saudis Pump at Record Before OPEC Meeting |