Mercedes-Benz C 300 2020 — technical service bulletin
Bulletin Launch NCU 20210 · NHTSA communication 10191256 · issued Mar 26, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2020
model years
9
vehicle entries
Official summary
Mercedes-Benz AG (?MBAG?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2020 C-Class (205) and GLE-Class (167) vehicles, the mixing ratio of coolant to antifreeze may not meet production specifications.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.