Note that Shell has a group that does "Fluid Management" for industrial plants that use a lot of lubricants - such as automotive manufacturing plants. I know because I worked with them (not for them) for about a year on a project in an automotive gear manufacturing plant. Under contract, they take over the management of all fluids in the plant - all lubricants, cutting fluids, cleaners, chemicals, etc. Naturally they end up replacing competitors lubricants with their own wherever they can, and outsource the rest of the stuff that isn't their core business (such as cleaners and other specialty chemicals). So they supply Shell greases and gear oils for this and that, Quaker State motor for the production engines, perhaps some Rotella for the air compressor crankcases, Pennzoil in the Tow Motor engines, etc, etc. So the simultaneous presence of the names Shell and Quaker State in an automotive plant seems to make perfect sense based on my experience. Now I really don't know if Shell is doing Fluid Management at the Hyundai plant or not. But in this thread, I see the names Shell and Quaker State mentioned as suppliers in the same plant. Again, it makes some sense based on my experience.