Never went into production but on paper Mercedes designed a W18 for the W140. That would have been something.

https://www.carscoops.com/2020/08/the-mercedes-benz-s-class-could-have-used-an-8-0-liter-w18/

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).