2016 — 2019
2.0L (M274) - SLC 300 Sport
Petrol
When starting from cold, listen carefully for any metallic rattle from the front of the engine, as the timing chain tensioners on M274 engines can occasionally show signs of wear as they accumulate kilometres.
Cycling through the 9G-TRONIC gearbox in manual mode while driving at low speeds; ensure the shifts feel smooth and responsive without any hesitation or mechanical 'clunking'.
Find a quiet patch of road with the roof down and up to listen for wind noise or creaks from the Vario-Roof seals; checking for any signs of water ingress in the boot well is a prudent step for any convertible of this age.
Ensuring the infotainment screen and COMAND controller respond immediately without flickering or freezing, as electrical gremlins are occasionally reported in R172 models after a few years of NZ sun exposure.
Consider a major service including spark plugs and transmission fluid flush.
Keep an eye on suspension bushings and engine mounts which may begin to soften.
Major milestone; ensure the water pump and cooling system components have been inspected for integrity.
Keep up with the strict Mercedes-Benz service intervals to protect the turbocharger health.
Ensure the Vario-Roof seals are kept clean and conditioned with a silicone-based product to prevent leaks.
Use only high-quality European spec engine oil to keep the variable valve timing system operating smoothly.
Regularly clear the drainage channels around the roof mechanism to prevent moisture build-up.
Check the tyre condition frequently, as the SLC's setup can be quite sensitive to uneven wear patterns.
Estimated repair costs if issues arise
In cars of this age, it's common to consider the longevity of cooling components. If the water pump shows weeping, you might eventually need to budget for a preventative replacement to maintain engine thermal efficiency.
Depending on the car's history on NZ's varying road surfaces, you might eventually need to budget for refreshing the suspension bushes to maintain that sharp handling feel the SLC is known for.
To ensure long-term reliability, it is common to consider a full transmission fluid and filter service. If this hasn't been done recently, it's a wise future budget planning move.
Noticed something inaccurate or missing?Suggest an edit→
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