2014 — 2016
E400 3.0L Biturbo V6
Petrol
Gently accelerate on a flat road to feel for any hesitation or surging in the 7-speed automatic gearbox; if it feels clunky, it may suggest the transmission fluid is overdue for a service.
While parked, turn the steering wheel lock-to-lock to listen for any groaning sounds, as the power steering pumps on these V6 units can sometimes show signs of age in higher mileage examples.
Opening the bonnet while the engine is cold to inspect the valley of the engine for any signs of oil residue, as the oil cooler seals can occasionally become brittle over time.
Testing every electrical feature, specifically the COMAND infotainment system and seat adjustments, as these complex cabin electronics are often the first to show their age in European luxury vehicles.
Consider a major service including spark plugs and transmission fluid flush.
Monitor suspension components such as control arm bushings and airmatic bags if equipped.
Check accessory drive belt and tensioners for any signs of wear.
Ensure the service history shows regular oil changes using high-quality synthetic lubricants, as the Biturbo engine relies heavily on clean oil for the turbochargers.
Verify that the cooling system has been inspected, specifically checking that the thermostat and coolant hoses are in good order.
Check for a recent brake fluid flush, which is vital for maintaining the performance of the Mercedes braking system.
Confirm the air filters have been replaced recently to ensure the twin turbos can breathe efficiently.
Inspect the tyres for even wear patterns, as these cars are quite sensitive to alignment and balance.
Estimated repair costs if issues arise
In some W212 models, the seals in the oil filter housing can harden over time, leading to minor leaks. If this needs attention in the future, it involves a fair bit of labour to access the area.
The E400 produces significant torque, which can lead to engine mount fatigue after several years. If you notice excess vibration at idle, you might eventually need to budget for a refresh.
If your specific trim features Airmatic suspension, be aware that air struts can eventually lose their integrity. It is common to consider a small rainy-day fund for this in case a leak develops.
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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