I had all this with the Subaru coolant. I wanted to get some OE stuff online, but the more I looked into it, the more unavailable is seemed to be.
So in the end I made sure that I knew the specification of the coolant (anti phosphate, anti amine), and used VAG G12 longlife, as my local mechanic used it which meant it was cheap because he orders it by the drum!
So you could make sure of the spec it needs to be , then use aftermarket that meets those specs.
OE coolants are all made by separate manufacturers. It appears that G12 is made by Valvoline.
It's definitely a more complicated subject than it used to be though!
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