Thank you for your recent inquiry through Costco.ca.
Costco purchases its gasoline from Petro Canada or Shell through vendors. Our pumps are the most technologically advanced units and our gas filters are regulated very stringently to ensure our members are receiving the best quality of gasoline available.
If you have any further inquiries, please reply to this e-mail or call our member service agents at 1-800-463-3783, Monday to Friday, between 9 a.m. and 6 p.m. EST. They will be happy to assist you.