The Mercedes-Benz M273 engine is a V8 automobile piston engine family used in the 2000s (decade). It was based on the similar M272 V6 introduced in 2004. An evolution of the M113 V8, all M273s have aluminium engine blocks, sequential port fuel injection, fracture-split forged steel connecting rods, a one-piece cast crankshaft, and a magnesium intake manifold. The cylinders are lined with silicon/aluminium, and a dual-length variable-length intake manifold is fitted. In addition to this, new features shared with the M272 include DOHC aluminium cylinder heads, 4 valves per cylinder and independent continuously variable valve timing on both the intake and exhaust sides. A new electronically controlled cooling system has eliminated the need for a mechanical thermostat for improved engine warm-up and optimum control of engine temperature.

E47

The E47 is a 4663 cc version. Bore and stroke is 92.9x86 mm. Output is 250 kW at 6000 rpm with 460 Nm of torque at 2700–5000 rpm. Applications:

E55

The E55 is a 5461 cc version. Bore and stroke increased to 98x90.5 mm. Output is 285 kW at 6000 rpm with 530 Nm of torque at 2800–4800 rpm. Applications:

• Note: 500 or 550 model naming varies depending on geographical market.