Sounds like the Costco RFT policy differs by location or individual.
I burn through 2 - 3 sets of performance tires per summer on the track. I took time to cultivate a relationship with the local Costco tire manager, because I knew that I would be working with him frequently. He's never let me down, replacing some tires under warranty, swapping different rims, etc.
Additionally, Costco is Class A. I've met Jim Senegal (founder / CEO) through various good works. He's always impressed me as an ethical businessman, and his company reflects this by giving back to the community and standing behind what they sell.
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2011 6MT RWD ClubSport Wagon | 3,185lbs | 1 of 149 ZSPs delivered in North America
Outside: BMW M-Aero, Euro region lighting, Seibon | Inside: M3 cockpit, Recaro SPG, Prototipo, AutoSolutions SSK, UCP | Stop: M3 ST-40R, PFC | Grip: Solid-mounted subframes, rear coilover conversion, M3 Nitron R3, Hyperco, SPL, AKG, ARC8 | Go: StageFP, CF snorkel, 3IM, MILVs, SuperSprint headers, Dundon Motorsports Inconel exhaust, VoltPhreaks | Cool: CSF | PCA #2018100384 | BMW CCA #505794
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