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Got the "Coolant Low" warning today and found out the coolant level is low on both the main reservoir and intake cooler reservoir.
For the main reservoir the level is right at the low mark, added about 500ml to get back to max line
For the small intake cooler one it's below the low mark, added about 50ml to reach the low mark, then added another 100ml to get to a reasonable level.
Car is MY2015, has 49.5k miles
Also found many white residue around the main tank cap.
I didn't pay any attention to the coolant level before so not sure if's a slow leaking somewhere or just a bad cap and too much evaporation over the years.
For M157/M278 owners, how's your coolant level? When's the last time you top-off?
I don't think mine loses any. If you even remotely doubt the coolant tank, just replace it (which includes a new cap). It's a wear item on....most Mercedes vehicles.
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