Who knows about this fluid? It's suppose to be the cure all for Hyundai's gear grinding 6 sp manual on the Genesis Coupe. They say the stuff to get is only available in gallons. And is only for the Evo 8/9. Part number mz320340

They say that is the only size you can get. But I see quarts on ebay of Diaqueen 75w85 for the Evo 8/9 with part number MZ320197.
2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual