2017 — 2023
2.0L Turbo - E300
Petrol
Listen carefully for any rattling or ticking sounds from the engine bay at cold start, as the M274 engine's variable valve timing components can show signs of wear over higher mileages.
Cycle through all drive modes and ensure the 9G-Tronic transmission shifts smoothly, particularly between first and third gears, to ensure the solenoids and valve body are performing as expected.
Operate the panoramic sunroof and all power windows repeatedly while stationary to ensure the motor mechanisms are not struggling or making grinding noises, which can occur as lubricant dries out over time.
Check the infotainment screen for any flickering or dead pixels, and use the touchpad to navigate the menus; unresponsive touch inputs can be a point of consideration in luxury vehicles of this age.
Consider a major service focusing on transmission fluid and filter replacements to keep the 9-speed gearbox shifting precisely.
A good time to inspect the engine and transmission mounts, as they can begin to lose their dampening effectiveness, potentially causing slight cabin vibrations.
Comprehensive check of the water pump and cooling system components, as these plastic parts are common areas for future maintenance planning.
Ensure the vehicle has a consistent service history, ideally performed by a Mercedes-Benz specialist or authorised dealer.
Regularly monitor the oil levels between service intervals, as these turbocharged engines can occasionally consume small amounts of oil as they age.
Prioritise the use of premium fuel to maintain the health of the direct-injection system and keep the engine internals clean.
Keep the vehicle's software updated; ensure the MBUX or Comand system firmware is current for optimal connectivity and system stability.
Verify the condition of the brake rotors and pads, as the E300's performance capabilities mean these are essential for safety and consistent stopping power.
Estimated repair costs if issues arise
If your E300 features the Air Body Control, it is wise to keep in mind that air struts can eventually develop leaks after several years of service. Budgeting for a potential replacement helps ensure you aren't caught off guard if the ride height levels out unevenly.
While reliable, the turbo system is a complex piece of engineering. If you notice a loss of boost pressure or a 'check engine' light in the future, it may relate to the actuator. Setting aside funds for this diagnostic and repair work is a sensible long-term approach.
Depending on the car's history, you might eventually need to budget for cooling system refreshing. Over time, the plastic housings can become brittle; replacing them as a preventative measure can save you from an unexpected roadside issue.
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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