2012 Mercedes-Benz S350 Engine Problems
- Complaints
- 3about this part
- Share
- 43%of 7 total for the year
- Median mileage
- 54,500miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the engine of the 2012 Mercedes-Benz S350, 43% of the 7 complaints for this model year. Where a mileage was given, the median is 54,500 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I did some research on mercedes 3.0l diesel motors and there seems to be an issue with the seal failing about 50,000 miles causing the motor to leak oil and the seal as well as the oil cooler need to be replaced. It is such a common problem on the 3.0l diesel engines that when you call any repair shop the first thing they ask is if the car is a diesel. Also the seal replacement is all over the mercedes blogs saying the same issue on the 3.0l diesels. …”
NHTSA complaint #10928395, filed 2016-11, 54,500 miles“The contact owns a 2012 mercedes benz S350. While driving approximately 65 MPH, the vehicle decelerated without warning. The contact then coasted over to the emergency lane and there were no warning lights illuminated. The vehicle restarted; however, the failure recurred multiple times. The vehicle was taken to the dealer for diagnostic testing. The technician diagnosed that the side charge air hose into the throttle actuator was torn and caused the loss of hose pressure. Both the left and right hose needed to be replaced. The vehicle was not repaired. …”
NHTSA complaint #10712016, filed 2015-04, 50,000 milesRelated service bulletins
- 11017039Apr 1, 2025Complaint Vehicle with atypical reduced heat output. Cause Silicate granulate may have escaped from a damaged bag in the expansion reservoir (not visible), reducing the coolant…
- 11008064Aug 9, 2024In our continuing efforts to ensure the proper performance and quality of your vehicle, we are writing to inform you that on certain Model Year 2011-2018 C-Class, E-Class…
- 11031736Sep 6, 2023In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA ("MBUSA") is extending…
- 11031648Oct 5, 2021Mercedes-Benz USA, LLC will provide an Extended Modification Warranty for each vehicle that has received the Approved Emission Modification. The Extended Modification Warranty…
- 10160738Apr 11, 2019Update engine electronics (ME-SFI) control unit software
- 10135639Oct 17, 2014Vehicle cannot be unlocked (CL), engine does not start - 12V starter battery discharged
Engine: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2012 | 3 | 43% |
Other parts of the 2012 Mercedes-Benz S350
2 complaintsTransmission and drivetrain
2 complaintsVehicle speed control
2 complaintsOther or unknown
1 complaints
← All problems reported for the 2012 Mercedes-Benz S350
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology