Cummins recommends their Fleetguard ES OAT Compleat 50/50 pre-mix coolant good for a million miles with annual testing.
Because of brand loyalty, Freightliner will push their coolant and say the Fleetguard is not compatible with their coolant reservoir sensor.....which is simply not true.
Kysor makes the coolant reservoir level sensor and a sensor is a sensor irregardless of the coolant.
You can read all you need to know about OAT coolant on Fleetguards website.
At Cummins recommendation I changed mine 4 years ago and no issues....coolant or sensor.
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