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These things are all relative in this class, but the mainstream S-Classes shouldn't be too ridiculously expensive to run. Residual (resale) values are relatively strong - though 'entry-level' S280 models lose value faster than the others and are thus a bit of a false economy, and there are plenty of thirstier saloons of this size. Servicing is as indicated by the on-board computer, so if you treat it gently, it should go a long time between trips to the Mercedes-Benz dealer. Insurance and company car tax liability will still be high, but not particularly so for this class; the diesel will be the most cost-effective. As for the others: the S600 does 19.1 mpg (combined) and emits a global-warming 355 g/km of carbon dioxide; the S55 AMG does 21.4 mpg and produces 317 g/km. As the Americans say, you do the math. Depreciation will make the S-Class a great used car buy, particularly at three years old when it will fetch around a third of its original new price. However, strong demand will mean that nearly-new and low-mileage cars will be expensive - better news for the sellers. The S-Class's general reliability, lifetime anti-perforation guarantee and good care should make it easy to run to very high mileages and for many years, and a good long-term prospect new or used. The S-Class may be a lot of money, but it is a lot of car. Better value used, of course, but if you're in a situation to buy one with your own hard-earned, at least opt for the diesel unless you really want to throw it away/treat yourself. The range does hold its value relatively well, and is as good a long-term investment as you'll find in this class. However, with the slightly smaller and more dynamic E-Class so good these days, do you really need an S? The new E55 AMG, with the 5.5-litre engine (476 bhp, 516 lb ft) is some 30K cheaper than the S55...
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