But they cannot change the owner of the vehicle on the records from the Manufacturer, yes they can find out recalls, but you are not going to get a letter in the mail from Nissan Canada or whom ever if you bought a used vehicle.
I've bought many used vehicles, never bothered to register them with the manufacturer and never received anything (despite visiting a dealer for repair / etc). If you call the manufacturer they will have you on record as the owner for future problems that could come up.