2015 — 2018
1.6L M270 I4 - B180 Facelift
Petrol
While idling in Park, listen closely for a slight rattle from the engine bay; it is worth noting that the M270 engine's timing chain tensioner can occasionally show wear in high-mileage examples.
Cycle through the 7G-DCT gearbox between Drive and Reverse on a slight incline; ensure the shifts are smooth as these dual-clutch units benefit from regular oil changes to maintain their responsiveness.
Before moving off, check the cooling system expansion tank for any signs of 'mayonnaise' or residue, as it is good practice to monitor the thermostat housing for potential leaks in these units.
Navigate over some uneven road surfaces and listen for any knocking from the front suspension, as the W246's bushings can naturally soften over time on our NZ roads.
Consider a transmission fluid flush to keep the 7G-DCT shifting crisply.
It is a sensible point to inspect the auxiliary drive belt and verify the condition of the turbo coolant lines.
Plan for a spark plug replacement and a thorough inspection of the engine mounts to ensure ongoing cabin comfort.
Verify the service book shows regular oil changes, ideally every 10,000 to 15,000km.
Ensure the panoramic sunroof, if fitted, has had its tracks cleaned and lubricated.
Check that the vehicle software has been updated during recent dealership visits.
Confirm that the air conditioning system is blowing cold, as a regas can sometimes be needed on cars of this age.
Inspect the brake rotors and pads, as they tend to wear according to the specific driving style of the previous owner.
Estimated repair costs if issues arise
These components can occasionally develop minor coolant seeps over time. It is wise to keep an eye on your coolant levels and budget for a cooling system refresh if you notice any drop in levels.
To keep your gear changes silky smooth, this service involves flushing the transmission fluid and replacing the filter. It is a vital piece of routine maintenance for long-term reliability.
If you notice increased vibration at idle, the rubber in the engine mounts may have fatigued. Replacing these can restore that 'Mercedes-smooth' feeling to the cabin.
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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