# Service bulletin LI35.31\-P\-066469

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: Service bulletin
- NHTSA id: 11023096
- Published by NHTSA: 2025\-09\-11
- Manufacturer's number: LI35.31\-P\-066469
- Manufacturer's date: 2025\-09\-10
- NHTSA component: POWER TRAIN

## NHTSA's summary

Complaint Possible humming noises from the drivetrain in the area of the rear axle, especially during tight cornering in the lower speed range. Remedy Note: Please follow the instructions in this document. The replacement of components \(other than those named for processing\) is not effective. Remedy: A test drive must be performed. For accurate analysis \(localization\) of the noise, the "Steelman Chassis Ear" noise diagnosis kit can be used, for example. If the rear axle differential is unambiguously identified as the cause \(noise source\), the oil must be replaced. Observe the following: 1. Warm up the oil in the differential by means of a short test drive. 2. Drain the oil from the differential and fill it with new oil according to the parts list in the attachment. Please follow the procedure described in AR.35.31\-P\-0523OLC. Note: To ensure that the differential is drained as completely as possible, both rear wheels should be rotated slowly 2\-3 turns while draining. Make sure that as little residual oil as possible remains in the differential. 3. Please advise the customer that in isolated cases the problem may continue to occur for another 30 to 60 miles after the oil has been replaced. If the problem is still present after the appropriate mileage: • Double check the appropriate mileage was driven. • Repeat the flushing and filling procedure a second time, make sure to properly flush all the diff fluid out • If no change after the second flush and additional mileage. replace the rear diff

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11023096-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11023096-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2018 MERCEDES BENZ C 300 4MATIC
- 2017 to 2018 MERCEDES\-BENZ AMG C43
- 2017 to 2018 MERCEDES\-BENZ AMG C63
- 2017 to 2018 MERCEDES\-BENZ AMG C63S
- 2018 MERCEDES\-BENZ AMG E43
- 2018 MERCEDES\-BENZ AMG E63
- 2018 MERCEDES\-BENZ AMG E63S
- 2017 to 2018 MERCEDES\-BENZ AMG GLC43
- 2018 MERCEDES\-BENZ AMG GLC63
- 2018 MERCEDES\-BENZ AMG GLC63S
- 2017 to 2018 MERCEDES\-BENZ AMG S63
- 2017 to 2018 MERCEDES\-BENZ AMG S65
- 2017 to 2018 MERCEDES\-BENZ AMG SLC43
- 2017 to 2018 MERCEDES\-BENZ C 300
- 2018 MERCEDES\-BENZ C 350 E
- 2017 MERCEDES\-BENZ C350
- 2017 MERCEDES\-BENZ C350E
- 2018 MERCEDES\-BENZ E 300
- 2017 MERCEDES\-BENZ E300
- 2018 MERCEDES\-BENZ GLC 300
- 2017 MERCEDES\-BENZ GLC300
- 2018 MERCEDES\-BENZ S 450
- 2018 MERCEDES\-BENZ S 550
- 2017 MERCEDES\-BENZ S550
- 2017 MERCEDES\-BENZ S550 4MATIC
- 2017 MERCEDES\-BENZ S550E
- 2017 MERCEDES\-BENZ S600
- 2017 MERCEDES\-BENZ S650
- 2017 MERCEDES\-BENZ SLC 43 AMG
- 2017 MERCEDES\-BENZ SLC300
- 2017 MERCEDES\-BENZ SLK 350
- 2018 MERCEDES\-MAYBACH S 560 4MATIC
- 2018 MERCEDES\-MAYBACH S 650
- 2017 MERCEDES\-MAYBACH S550
- 2017 MERCEDES\-MAYBACH S600
- 2017 MERCEDES\-MAYBACH S650

JSON: [/v1/bulletins/11023096](/v1/bulletins/11023096)

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