I was working on a 2013 Elantra that was due for a cooling system service. The manual only specified an ethylene glycol coolant with no additional detail. Surprisingly, Hyundai also specifies a very long interval for the first coolant change - 120K.
So, I decided to use a green Asian HOAT coolant. I had some Motorcraft Specialty Green Engine Coolant leftover from another vehicle (a Mazda calling for FL-22) so I decided to use it for this Elantra. Of course I was a little short, so I made up the difference with Nissan Green Coolant.
However, this is where I am confused: most Asian HOAT green coolants specify a shorter service life than the premixed blue Asian coolants. Hyundai recommends generic Ethylene Glycol coolant yet specifies a very long interval (they are an outlier). However, some of the green Asian coolants such as Fl-22 have a service life that is similar to the Blue Coolants. Does anyone have any additional info on the chemistry of FL-22? Is it more similar to the blue coolants? Or are all Asian HOAT coolants the same (regardless of color) and the water quality has a greater impact on coolant service life.