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Mercedes M272 3.5L Engine Review

M272 3.5L Engine

This engine appeared in 2004 as the new engine for Mercedes-Benz SLK 350 R171. M272 series is the new generation of V6 Mercedes engines. The 3.5-liter engine came to replace the old M112 E32 and M112 E37 engines.

The M112 engine lies at the base of M272 engine design. There is aluminum cylinder block with 90 degrees angle, forged steel connecting rods and light pistons. The dimension between cylinders is the same 106 mm. The M272 engine also has a balancer shaft inside the engine block. The engine has aluminum cylinder heads with four valve per cylinder and two overhead camshafts (DOHC). The diameter of the intake valve is 39.5 mm, exhaust - 30 mm.

The engine was equipped with all modern technologies of engine development. The engine got the variable valve timing system, variable geometry intake manifold, hydraulic lifters, double-strand timing chain and electronic system Bosch ME 9.7.

The M273 E46 and M273 E55 engines are the part of this one family. The new version of the M272 V6, which name is M276 DE35, came out in 2011.

Engine Specs

Manufacturer
Stuttgart-Bad Cannstatt Plant
Production years
2004-2013
Cylinder block material
Aluminum
Cylinder head material
Aluminum
Fuel type
Gasoline
Fuel system
Fuel injection
Configuration
V
Number of cylinders
6
Valves per cylinder
4
Valvetrain layout
DOHC
Bore, mm
92.6
Stroke, mm
86.0
Displacement, cc
3498
Type of internal combustion engine
Four-stroke, naturally aspirated
Compression Ratio
10.7, 12.2, 11.7
Power, hp
258/6000
272/6000
292/6400
305/6500
Torque, lb ft
250/2500
258/2400
270/3000
265/4900
Engine weight
Firing order
1-4-3-6-2-5
Engine oil weight
0W-30, 0W-40, 5W-30, 5W-40
Engine oil capacity, liter
8.0
Oil change interval, mile
6,000
Applications
C 350 W203, C 350 W204, CLK 350 C209, CLS 350 W219, GLK 350 X204, E 350 W211, E 350 W212, ML 350 W164, S 350 W221, SL 350 R230, SLK 350 R171, Sprinter, Viano 3.5/Vito 126, R 350, CLC 350

M272 KE/DE 35 3.5l Engine Problems and Reliability

1. Oil Leaks. Check the plastic plugs of cylinder heads; perhaps they need to be replaced.
2. Intake manifold valves issue. The engine operates unstably with that problem. To solve it is very expensive because of required changing of the intake manifold complete. This problem occurs on engines until 2007.

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