Mercedes-Benz Engine

M273

The Mercedes-Benz M273 is a DOHC V8 gasoline piston engine.

Years
2006–2011
Configuration
V8
Fuel
Gasoline
Top power
387 PS

The M272’s V8 twin — 5.5 liters, four cams, and the last naturally aspirated big eight before AMG went biturbo.

Sharing the 90° architecture and dual-length intake of the M272 six, the M273 displaced 5,461 cc (98 × 90.5 mm) at 10.7:1 compression. It replaced the M113 in volume models from about 2006 — SL 550, CLK 500, CL 500, GL 450/500 — with outputs near 285 kW and 530 N·m.

AMG still preferred the M156 and later the M157 for 63 models, so the M273 remained the mainstream V8. By the early 2010s the biturbo M278/M157 family had largely superseded it.

Versions.

Every factory version of the M273.

VersionDisplacementBore × StrokeCompressionPowerTorque
273.9655,461 cc 98 × 90.5 mm 10.7285 kW (382 hp; 387 PS) at 6,000 rpm530 N·m (391 lb·ft) at 2,800 rpm