* The differential has grown as U.S. refiners plan more extensive than usual downtime for maintenance this autumn, and pipelines are clogged, industry officials said.
* Analysts said they expect the differential to remain higher than usual, and volatile, in coming months.
* The Syncrude oil sands site began restoring production last month, adding to a squeeze moving crude from Alberta via pipeline and rail.
* Light synthetic crude from the oil sands for September delivery last traded at $3 a barrel over WTI, unchanged from Friday’s settle.
(Reporting by Julie Gordon in Vancouver; Editing by Richard Chang)
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