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53? That’s new… Correct. Welcome to our first crack at an AMG ‘53’ – an entirely new breed of AMG quite unlike any we’ve seen before, but no doubt like many we’ll see as time goes on… Cryptic. Why’s that? Well, long gone are the days Mercedes/AMG numbered its cars according to what engine was under the bonnet. The AMG 53 does not have a 5.3-litre engine. It doesn’t even have eight-cylinders. It has six – and not arranged in a vee and twin-turbocharged like an AMG 43. The Mercedes-AMG CLS 53 4Matic + (and breathe) has the same inline six-cylinder engine as the S500 and CLS450, with its 48-volt electrical infrastructure and ‘EQ Boost’ starter/alternator that separates the engine and transmission. It gives a momentary boost of 22bhp/184lb ft, an engine-off coasting/gliding function and perhaps the smoothest stop/start we’ve ever experienced.