Mercedes-Benz S550 2015–2017 — technical service bulletin
Bulletin CL- Engine Coolant · NHTSA communication 11031734 · issued Feb 21, 2020
Technical service bulletin
communication type
Engine
component
2015–2017
model years
7
vehicle entries
Official summary
The purpose of this letter is to advise you of additional benefits that Mercedes-Benz USA, LLC ("MBUSA") is providing to you regarding your vehicle ownership. What's Included In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, MBUSA is extending the warranty to a total of 10 years and 120,000 miles from the vehicle's original New Vehicle Limited Warranty start date for coolant system repairs that may be needed arising from an illumination of a Malfunction Indicator Lamp ("MIL") due to engine coolant backflow in
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.