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Q:

What coolant should I use for this vehicle? on 1999 Mercedes-Benz ML430

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The radiator light came on for the first time in 5 yeas.
(1) Answer
You have a much more serious problem than what kind of coolant. Have you done anything with the cooling system in 5 years?