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The S550 covers the V8 flagship S-Class before the badge became S560 in 2018, built across the facelifted W221 from 2010 and the newer W222 from 2014. In Saudi Arabia it is the way into V8 S-Class ownership at a lower entry price than the current model.
A 2014-onward car gets you the current-shape W222, a completely different platform and cabin from the outgoing W221 that ran until 2013. Mercedes retired the S550 name in 2018 in favour of S560, so a 2017 car is the newest you will find under this badge.
A BMW 750 costs similar money and our inspections find electrical faults on it more often than we would expect for the class. The Lexus ES250 is a smaller, cheaper car in a lower class if V8 presence is not the priority. Within the Mercedes range, the E350 is the mid-size alternative for buyers who want less car for less money.
A long way, if the twin-turbo V8 has had consistent servicing. The cars we inspect come in at a median of around 145,000 km and are still in circulation, a normal outcome for this platform rather than an exceptional one. Air suspension and cooling system upkeep matter more here than the mileage figure itself.
On a V8 S-Class at this mileage, the CarSwitch inspection report is what tells you whether it has been maintained to the standard the badge implies.