M256 engine
The M256 engine is fitted to 3 generation(s): Mercedes-Benz S-Class, Mercedes-Benz M-Class / GLE, Mercedes-Benz GL / GLS.
Common problems and what to check
Engine: Mercedes M254/M256/M276/M278/M176
- engines are complex and expensive to repair; oil leaks and chain issues occur on M276/M278 at high mileage
What to check when buying: dealer service history; chain noise.
Tip: Service with specialists, oil MB 229.5 or higher.