Mercedes-Benz M 116 V8 engine. In 1969, this power plant was initially available in the 300 SEL 3.5 (W 109), 280 SE 3.5 Cabriolet and 280 SE 3.5 Coupé (both W 111) models.

D576858 Magic number: “3.5”: Premiere of the legendary Mercedes-Benz V8 models at the  1969 IAA
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