Wall Street Journal | Oil Prices Slide to 6½-Year Low Wall Street Journal Crude-oil futures on the New York Mercantile Exchange dropped to a more-than six-year low Friday on escalating concerns about demand from China following the yuan's devaluation. Nymex oil futures for delivery in September hit a low of $41.35 a barrel, ... US oil sinks to 5-month low as dollar strengthens after upbeat data |