Mercedes-Benz M254

M254 Engine

The M254 is a 2.0-liter turbocharged inline-4 petrol engine with a 48V mild-hybrid system. It succeeds the M264 and features advanced technologies like NANOSLIDE cylinder coating and CONICSHAPE cylinder honing. It serves as a core powertrain for the latest C-Class and GLC models.

This overview summarizes the reliability of the Mercedes-Benz M254, including common issues and cost drivers.

Mercedes-Benz M260 engine (closest available image for M254) — Image credit: Wikimedia Commons · CC BY-SA 4.0

Technical Specifications

Manufacturer

Mercedes-Benz

Fuel Type

Petrol

Displacement

2.0 L

Production

2021–Present

Power Output

204–258 hp

Emissions

Euro 6d

Reliability Analysis

With a risk score of 3.5/10, the M254 is showing promise as a reliable and efficient powertrain. Its integration of mild-hybrid technology improves driveability and efficiency. As a newer design, it benefits from Mercedes' latest engineering advancements. While long-term durability is yet to be fully proven, initial quality is high.

Highly Recommended

Autoscore Verdict

Highly Recommended. A modern, efficient engine that appears to be a strong performer in the lineup.

Risk Score

3.5

out of 10

Common Problems & Weak Points

Issue	Typical Mileage	Repair Cost (Est.)	Severity
Limited Long-Term Data	~150,000 km	€0 – €500	Low

Limited Long-Term Data

The M254 is a relatively new engine, introduced in 2021. As such, comprehensive long-term reliability data is still being gathered from the fleet. Early reports are positive, but potential issues may only surface as vehicles accumulate higher mileage. Currently, there are no widespread endemic failures reported.

Typical Mileage: 150,000 km

Cost: €0–500

Buyer's Inspection Checklist

Ensure all software updates have been applied, as this is a highly digitized engine.
Check for smooth operation of the start/stop system, powered by the ISG.
Verify routine maintenance has been performed by a qualified workshop.

Frequently Asked Questions

Is the M254 engine reliable?

The M254 has known weak points, but with good maintenance the reliability is solid. See the risk analysis and common problems for specifics. Start a report for a specific car.

How expensive are typical repairs?

Common repairs fall into a mid-range cost band depending on the issue and workshop. Check the cost ranges in the table. Use the used car report for specific listings.

Which model years are best for this engine?

Newer production years often include technical updates. Review the production years and revisions in the specs. Use Car Check for quick screening.

Related Engines