The Mercedes coolant is not OAT, but HOAT (Hybrid Organic ...). Not the same.

As far as nitrites (SCAs) to prevent cavitation damage, this is true for all engines, Mercedes makes a point of it in their literature showing the damage to a water pump impeller from cavitation. In the block however, this is more of a concern with wet-sleeve diesel engines where cavitation pitting will create holes through to the combustion chamber, in these Mercedes dry-sleeve engines it is not a risk to the block and sleeves.

So, ... I prefer Mercedes coolant or ZEREX G-05, in all of my Mercedes cars, replace regularly unless you have purchased a newer coolant tank with the SCA block in the bottom (or test your coolant annually as I do and top-up your SCAs as needed).

I would not run away from a green-coolant Mercedes, it is a small oversight if a car is otherwise well maintained IMO.

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Gone to the dark side

- Jeff