Ravenol have now - as a single? - oil for Haldex. AWD-H. But, one for all Haldex types. VAG have at least 2 types. Hmm...
Maker of OEM is imho Pentosin. Developed in years with Haldex. Pentosin may not make aftermarket buisness with Haldex-oil.
Special on Haldexoil is... no one "outside" knows it. But it IS special. This will be evident if you make at changes your knockles dirty thereby.
Its feel like 0W-16, but you need 15min., 3 big cloths und 1gal brake cleaner
to make your knockles clean again. I have never see such oil.
Not ATF, not MTF, not engine oil, not damper oil nor another oil. Lunacy.
You need only a one quart. Every ~30T miles. For me those 30 bucks (-> 30.000 miles) are dont most painful expenditure in car maintenance
But 30$ for quart oil is very expensive. That's correct.