2007 — 2009
5.5L (M273) V8 - E550 Elegance/Avantgarde
Petrol
While accelerating gently, pay close attention to the 7G-Tronic transmission for any 'flaring' or hesitant shifts; this can occasionally occur as fluid ages.
Before turning the engine on, press the Airmatic suspension button to raise the vehicle and listen for any excessive compressor noise or uneven lifting.
During your inspection, check the valley of the engine block near the oil filter housing for any signs of seepage, as the M273 engine’s oil cooler seals can occasionally wear over time.
Check the infotainment screen while stopped; confirm that the COMAND system recognizes all peripherals, as glitches in the early fiber-optic loops are worth noting.
Time to inspect suspension bushings and potential Airmatic strut wear.
Often the point where spark plug replacement and transmission fluid flushes are recommended for peak performance.
Consider a proactive check of the engine mounts and transmission mounts to maintain that signature smooth V8 ride.
Prioritize high-quality synthetic oil changes every 10,000km to keep that M273 V8 internals happy.
Keep an eye on the radiator coolant levels; it is good practice to ensure the cooling system is free of debris for optimal engine temps.
Check the condition of the auxiliary battery in the trunk, as these can sometimes drain if the car sits for long periods.
Regularly clean the drain plenums under the windshield cowl to prevent water ingress near the cabin air intake.
Ensure the air suspension lines are clear of debris when you have the car up on a hoist during a pre-purchase inspection.
Estimated repair costs if issues arise
If the vehicle begins to sag after being parked, you might eventually need to budget for replacing the pneumatic struts, which is a common task for cars of this age.
To keep the V8 vibrations dampened, you may find that replacing these rubber mounts improves the refinement of the cabin over time.
Depending on the specific engine serial number, it is worth checking the service history to see if the timing components have been reviewed, as this is a more involved mechanical service.
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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