Is it important to only use the Benz Coolant when you flush and fill radiator fluid in a 1993 400SEL
The last time I had the coolant flushed and refilled at the Benz dealership, they guys told me to use only Benz coolant as Prestone and other 5 year coolants do not mix with the few remaining drops of Benz coolant when the system is flushed and will make the Prestone " a fluid like jello" and that situation would be difficult to rectify.
Is that true?