The discount on Western Canada Select (WCS) heavy crude versus the North American benchmark West Texas Intermediate (WTI) held steady on Friday:
* WCS for September delivery in Hardisty, Alberta, settled at $12.25 a barrel below WTI, according to brokerage CalRock, having settled at the same level on Thursday after narrowing for five straight trading sessions
* Markets worry that any Canadian rail stoppage would cut prices of Canadian crude due to lack of takeaway capacity
* The expansion of the Trans Mountain pipeline has, however, limited the reliance on rail to transport crude oil from Canada to the United States
* Canadian heavy crude differentials had gained support this month from some U.S. Midwest refineries restarted operations after unplanned shut-downs in July
* Global oil prices settled down nearly 2% on Friday, little changed on the week with Brent crude below $80 a barrel, as investors tempered expectations of demand growth from top oil importer China.
(Reporting by Arathy Somasekhar in Houston; Editing by Mohammed Safi Shamsi)