Brent oil fell by $1 on Friday, putting it on track for its first monthly loss in four months, under pressure from worries over emerging economies turmoil and weak global stock markets.

U.S. crude also fell as traders took profits ahead of the weekend, although losses were stemmed by rising heating oil futures prices, which gained 1.5 percent on cold-weather demand. The spread between the two benchmarks fell below $9 for the first time in nearly 3 months.