Suncor, on September 18, started a 30-day planned maintenance turnaround of the 90,000-barrel-per-day (BBL/d) Fluid Coker 8-1, 90,000-BBL/d Fluid Coker 8-3 and Heavy Gas Oils (HGO) 1 (Plant 15-1) units at its 265,000-BBL/d Mildred Lake Oil Sands Upgrader and Refinery in Fort McMurray, Alberta.