To be losing that much coolant in a short amount of time and/or miles, there’s got to be a leak somewhere. If there’s residue anywhere, then it’s a no brainer and the dealer should be replacing the tank and cap at a minimum. Maybe try a different dealer and see if you get another result. Is it possible that the car burns off some coolant, especially if it’s driven how it’s intended? Probably, but not to your extent. In relation to this now that my tank has been replaced and all is good now, I’m going to have a 90 degree thermostat installed to keep things a bit cooler.
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