Can I use the American Express Blue Cash Preferred card at Costco and what are its benefits?

The American Express Blue Cash Preferred card cannot be used for purchases inside Costco warehouses due to Costco's exclusive partnership with Visa for in-store transactions. However, one can use the Blue Cash Preferred card to make purchases at Costco.com and for gasoline at Costco gas stations, where American Express cards are accepted. The Blue Cash Preferred card offers a strong rewards program, providing 6% cash back on supermarket purchases in the U.S. (up to $6,000 per year, then 1%), 6% cash back on select U.S. streaming subscriptions, 3% cash back at U.S. gas stations and on transit including taxis, rideshare, parking, tolls, trains, buses, and more. For other purchases, it offers 1% cash back. This card comes with a sizeable welcome offer and additional benefits including access to Amex Offers, car rental damage protection, and extended warranty coverage that enhance its value proposition for shoppers looking to maximize their rewards.