I almost backdoored my way into doing a Nissan service shop with a Hyundai. My local Hyundai and Nissan dealerships are both owned by the same group, and are basically one continuous lot. The way they operate both service departments is also somewhat continuous. They perform all (Nissan and Hyundai) oil changes, tire replacements and scheduled maintenance in the Hyundai service department, and repairs in the Nissan service department. Interestingly enough, when I purchased my Hyundai, the dealership gave me the little "Nissan Rewards" keytag.
Since the Nissan service departments are regularly shopped, I posed the question to the MSC that since the departments are conjoined and I had the Nissan Rewards keytag, could I use my Hyundai. They were genuinely surprised and actually considered my proposal, but ultimately their client said that there was a chance I wouldn't deal with a service advisor in their system and couldn't do it.
So close. It would have been such a sweet deal getting paid to go get no-charge warranty work done.