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Any year of this generation is a safe bet, since the platform, V8 and mild-hybrid system have not changed materially since the 2020 launch. A newer car mainly buys lower mileage and the latest driver-assistance software, not a different drivetrain underneath.
The BMW 530 is far cheaper, smaller, and shows prior body or panel repair on 52% of cars against the 64% we would expect for saloons of this age and mileage here. The Mercedes C300 is also far cheaper and retains 50% after five years, for a buyer who wants the badge without the flagship size.
The S580s we inspect here run to a median of around 52,000 km, low mileage that reflects how recent this generation is rather than saying anything yet about long-term durability.
Book the CarSwitch inspection on any S580 you shortlist, since it confirms a car this new is as good as its mileage suggests.