2013 — 2017
3.0L V6 Biturbo (M276) - S350
Petrol
Gently accelerate from a standstill and observe the gear changes. It is common to consider that these 7G-Tronic or 9G-Tronic transmissions benefit from fresh fluid, so look for any hesitant or jerky shifts in lower gears.
Adjust the air suspension settings through the drive select menu while parked. Listen for any persistent pump noise or uneven ride height settling, as air struts are a common consideration for cars of this age.
With the engine running at idle, pop the hood and listen for any rhythmic clicking or metallic ticking. It is worthwhile to be aware that the M276 engine's timing chain tensioners can occasionally exhibit signs of wear during cold starts.
Cycle through the COMAND infotainment system and ensure the touchpad and rotary controller feel responsive. It is common for these complex electronics to experience minor glitches, so ensuring full functionality during the inspection is a good idea.
Usually marks the period for a comprehensive spark plug change and major transmission fluid service.
Often the time to inspect the condition of the air suspension bellows and engine mounts for signs of natural wear.
Typically recommended to assess the ancillary drive belts and cooling system components like the water pump.
Verify the service book history to ensure the engine oil has been changed at least every 15,000km or annually.
Check the brake rotors and pads, as the S-Class is a heavy vehicle and consumables tend to wear in line with its size.
Confirm the air conditioning system is blowing cold air, as the dual-zone systems are complex and benefit from regular cabin filter changes.
Inspect the tires for even wear patterns, which can indicate if the wheel alignment needs a quick refresh.
Ensure all electrical modules, including the powered boot lid and door soft-close functions, are cycling smoothly.
Estimated repair costs if issues arise
If the ride height begins to drop overnight or the compressor struggles, you might eventually need to budget for replacing the air struts. It is a known wear item as these vehicles age.
As these cars prioritize a smooth ride, the rubber engine mounts can soften over time. If you notice increased vibration at idle, it's worth considering a budget for fresh mounts to restore that signature Mercedes refinement.
While the M276 is robust, if you hear a brief rattle on startup, it is a good idea to consider professional inspection. Proactive maintenance on the timing chain system can prevent larger issues later.
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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