It’s a great Did You Know factoid that AMG wasn’t involved in the first express-spec E-Class.

When Mercedes decided five years was long enough for the original (1985) M5 to have had its own way in the mid-range sports sedan arena – longer if you count the M535i – the Stuttgart brand sought the help of close-neighbour Porsche to create a muscled-up, V8-powered version of the W124 sedan.

AMG, as a tuning house, would take that 500E (later E500) a step further as the E60 AMG, though today of course it’s not just integrated with the carmaker but a fully fledged sub-brand.
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https://www.caradvice.com.au/665659/2018-bmw-m5-v-mercedes-amg-e63-s-comparison/