S-Class (W221)2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600
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Last week I got a "Check Engine Coolant" message/alert displayed briefly after starting the car in the morning (engine as cold as it ever gets in Hawaii). After engine warmed the display cleared, engine temp normal and no indication of a problem throughout the day. Debated simply adding a little water, but decided to go with the MB recommended spec no. 325 (P/N Q1 03 0002) Anti-Corrosion/Antifreeze Agent from the local dealer for ~$38/gal.
It took about 0.8 quarts of fluid to bring the level just above the full (cool) tab in the surge tank.
Now I'm just wondering if its common to lose minor amounts of coolant over time? I've had the car 1.5 years, driven 75/25 city/highway) and 13,000 miles; one "A" service completed last December.
I did a search of the forums and the net and it didn't seem to be a common issue...
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