"Western Canada Select, the regional benchmark for low quality, viscous heavy oil, is trading at extreme discounts to other regional blends. It is selling for $63 a barrel this week compared with $86 for similar heavy, sour crude from Mexico and $94.50 against West Texas Intermediate, the US oil benchmark.
According to official figures, Canada exported 2.42m barrels a day of crude to the US in the second quarter of the year, and only 93,000 b/d to other countries."