# Warranty extension EW \- Cylinder Head M264

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Warranty extension
- NHTSA id: 11027580
- Published by NHTSA: 2026\-01\-10
- Manufacturer's number: EW \- Cylinder Head M264
- Manufacturer's date: 2026\-01\-10
- NHTSA component: ENGINE

## NHTSA's 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. \(e.g. exhaust valve, cylinder head\). The exhaust valve guide and/or seat may wear irregularly over time due to increased lateral forces during operation. This could potentially cause a combustion misfire, resulting in an activation of the check engine Malfunction Indicator Lamp \(“MIL”\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027580-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027580-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- 2019 to 2023 MERCEDES\-BENZ C 300
- 2021 to 2023 MERCEDES\-BENZ C 300 4MATIC
- 2018 to 2019 MERCEDES\-BENZ E 300
- 2020 to 2023 MERCEDES\-BENZ E 350
- 2020 to 2023 MERCEDES\-BENZ GLC 300
- 2023 MERCEDES\-BENZ GLC 300 4MATIC
- 2020 to 2023 MERCEDES\-BENZ GLE 350

JSON: [/v1/bulletins/11027580](/v1/bulletins/11027580)

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