Where in TO are you???
I think that you want to get Duron synthetic ( 5W-40) in a gallon, or if I am mistaken, the 15W 40??
On Woodbine, just South of Hwy 7 by like 2 blocks on the West side is Woodbine Truck Center (Sales leasing, and Parts).
It is North of Steeles quite a bit. Open Saturday but closes at 12:30 or so.