2018 — 2020
2.0L M264 E20 DEH LA I4 - E350 EQ Boost
Hybrid/Petrol
Listen closely for any rattling sounds at cold start. The M264 engine utilizes a 48V mild-hybrid system, and sometimes the starter-generator or the belt assembly can exhibit minor noises that are worth monitoring as the vehicle ages.
Check the 12.3-inch infotainment display for any signs of flickering or dead pixels. The MBUX system is sophisticated, and occasionally the digital screen units can require a software update or module reset in high-mileage examples.
While driving in stop-start traffic, pay attention to the transition between the combustion engine and the EQ Boost system. Ensure the gear shifts from the 9G-TRONIC transmission remain smooth and seamless, as these units benefit from consistent fluid care.
Operate the air suspension (if equipped) by toggling through the drive modes. Ensure the vehicle levels itself promptly without any audible groaning or uneven sagging after being parked for a few minutes.
Usually time for a thorough inspection of the suspension bushings and a first look at the 9G-TRONIC transmission fluid health.
Consider a full check of the 48V battery health and auxiliary components to ensure the EQ Boost system continues to perform at its peak.
Recommend a deep dive into the engine cooling system and a status report on the turbocharger actuators.
Ensure the oil changes are performed strictly using high-spec Mercedes-Benz approved synthetic oils to protect the turbocharger.
Keep the engine air filters clean to ensure the M264 engine breathes efficiently.
Check the condition of the multi-ribbed belt for the EQ Boost system during every major service interval.
Keep the MBUX software updated at your local service centre to maintain system stability.
Monitor brake pad and rotor wear regularly, as the regenerative braking system can sometimes hide the true wear state of the physical friction components.
Estimated repair costs if issues arise
If you notice the vehicle sitting lower after sitting for a few days, it is wise to plan for the eventual replacement of air struts. Given the complexity of the W213 suspension, budgeting helps ensure you can maintain that signature Mercedes comfort.
To keep the shifts buttery smooth, this transmission requires a dedicated service. Setting aside funds for this every 60,000-80,000km is a great way to ensure the long-term reliability of your drivetrain.
As these vehicles advance in years, it's proactive to consider the potential for eventual battery module aging. While not a regular maintenance item, having a buffer for future electrical health is a prudent approach for any mild-hybrid luxury owner.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer