Mercedes-Benz C 300 2018–2023 — warranty extension

Bulletin EW - Cylinder Head M264 · NHTSA communication 11027580 · issued Jan 10, 2026

Warranty extension

communication type

Engine

component

2018–2023

model years

vehicle entries

Official summary

In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA, LLC is extending the warranty coverage on the exhaust valve system in certain Model Year (MY) vehicles listed below from the original New Vehicle Limited Warranty of 4 years/50,000 miles to 15 years/150,000 miles, whichever occurs first. This extended warranty applies to the condition described below that may necessitate the repair or replacement of components related to the exhaust valve system on the 4-cylinder engine M264. (e.g. exhaust va

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.

Mercedes-Benz C 300 2018–2023 — warranty extension

Official summary

Vehicles covered