Crude oil futures were lower Thursday in New York, continuing the three-month slide that has coincided with traders' worries the global economy is slowing sharply. November-dated light, sweet crude was down $2.05 to $86.90 a barrel, and Brent crude was off $1.04 to $83.32 a barrel. Heating oil was losing 6 cents to $2.44 a gallon, and reformulated gasoline was fractionally weaker at $2.03 a gallon. Natural gas rallied a bit, adding 6 cents to $6.80 per million British thermal units. Among energy stocks, Exxon Mobil ( XOM), ConocoPhillips ( COP) and Chevron ( CVX) were all losing more than 5%. BP ( BP) and Royal Dutch Shell ( RDS.A) were showing similar declines. Schlumberger ( SLB) and Halliburton ( HAL) were easing less than 1% each. The U.S. Oil ( USO) ETF was down 1.8%. Elsewhere in commodities, metals were flat. Gold was up 20 cents at $886.70 an ounce, and silver was giving back 4 cents to $11.83.