Small losses like that are often the EGR cooler. I’ve had this happen enough times at work, I can smell it before I even see the coolant level dropping. To me, it makes the exhaust (when hot) smell faintly like rotting cotton candy. It’s hard to explain, but it doesn’t smell like regular exhaust when it starts happening.
Usually the EGR cooler cracks because it isn’t getting enough coolant flow because the Engine Oil Cooler is plugged. . When you’re driving, do you see much difference between the Engine Oil Temp and Engine Coolant Temp?
2000 E450 dually V10 wagon