I contacted Shell Canada and they informed me that the synthetic used in Formula Shell Synthetic Blend is PAO. Also, they provided me with the following specs:
Formula Shell Synthetic Blend 5W30
Pour Point -42C
Flash Point 225C
CCS, cp 5223@-25C
Borderline Pumping (MRV) -40.4C
The above suggests that this would probably be a good choice for Canadian climate.