I was looking on the Castrol Site(s). For an F-150 Ecoboost on the U.S. site, the Edge oils are recommended, with no oil change interval listed(assuming due to Ford's OLM). On the Carribean site,an OCI of either 5k or 10k miles is listed. On the Canadian site, OCI's are at 3125 km or 6250 km. Anyone have any insight as to why the difference, particularly the Canadian one?