Was at local Edmonton Wal-Mart today and picked up a 4L. jug of Mobil1 supersyn for $23.60. The 5W-30 and 10W-30 were both on for this "as advertised" price -- could be this weekend's flyer special. The local Canadian Super Store is selling one litre bottles of both weights for $5.87. Why buy others when Mobil1 is on at this price???