53 is the new 43, but it’s closer to 63 in more than just numbers.

In case you’re wondering, yes, this new Mercedes-AMG E53 is the replacement for the E43 AMG gone by. If you happen to own one of those, it’s now a collectible of some kind… Sort of. Since the numbers at the end of AMG models seem to have no actual correlation to anything comprehensible, given there was a time when 55 meant a 5.5-litre engine or 63 meant an (almost) 6.3-litre engine, we may as well embrace the 53 nomenclature now.
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https://www.caradvice.com.au/695910/2019-mercedes-amg-e53-review-coupe-and-cabriolet/