6.3 Amg -

The original 300 SEL 6.3 was a "sleeper" sedan that combined a luxury chassis with the massive 6.3L M100 V8 from the 600 limousine.

The badge represents a legendary chapter in Mercedes-Benz history, serving as both a tribute to the brand's first V8 production sedan—the 300 SEL 6.3 —and a label for the modern, high-performance "63" series. While modern 63 models often use smaller turbocharged engines, enthusiasts primarily associate the "6.3" lettering with the M156 6.2-litre naturally aspirated V8 , the first engine developed entirely in-house by AMG. The Heritage: 300 SEL 6.3 (1968–1972) 6.3 AMG

Most modern 63 models use a 4.0-litre V8 Biturbo engine (M177/M178), producing significantly more power than the older naturally aspirated versions. The original 300 SEL 6

Built on the "One Man, One Engine" principle, where a single technician hand-assembles and signs the engine plate. Evolution of the "63" Badge The Heritage: 300 SEL 6

Following the naturally aspirated era, Mercedes-AMG transitioned to smaller, forced-induction engines while retaining the iconic "63" badge to signify top-tier performance.

Introduced around 2007, this engine is often called "the 6.3" despite its actual displacement. It is celebrated for its raw, muscle-car character and distinctive, aggressive exhaust note.