With a 2.5-liter working volume, the Mercedes M272 E25 engine was introduced in 2005 with the goal of replacing the M112 E26. The engine block is identical to that of the M272 E30, but a crankshaft with a 68.4 mm piston stroke is utilized.
M112 E24, M112 E26, M112 E28, M112 E32, M112 E37, M272 E25, M272 E30, M272 E35, M276 DE30, and M276 DE35 are all members of the V6-family.
The cylinder heads are aluminum, have two camshafts (DOHC), four valves per cylinder, an exhaust valve diameter of 28 mm, and an inlet valve diameter of 37 mm, just like the M272 E30. Hydraulic lifters, a dual-mode intake manifold with adjustable length, and stepless variable valve timing on the intake and exhaust camshafts were all utilized. The timing drive is a chain with a chain resource of roughly 150,000 kilometers. ME control system 9.7 from Bosch.
Specifications
| Production years | 2005-2011 |
| Displacement, cc | 2496 |
| Fuel system | distributed injection |
| Power output, hp | 204 |
| Torque output, Nm | 245 |
| Cylinder block | aluminum V6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 88 |
| Piston stroke, mm | 68.4 |
| Compression ratio | 11.2 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | yes |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 8.0 |
| Fuel type | petrol |
| Euro standards | EURO 4/5 |
| Fuel consumption, L/100 km (for Mercedes C230 W204) — city — highway — combined |
13.5 6.9 9.3 |
| Engine lifespan, km | ~275 000 |
| Weight, kg | 177 |
Disadvantages of the M272 KE25 engine
This power unit’s timing drive is its weakest component.
The entire timing drive is rendered useless due to the balancer shaft sprockets’ quick wear.
A stuck exhaust manifold flap is another known issue.
For fifty to seventy thousand kilometers, plastic cylinder head plugs leak oil.
When the engine overheats, the aluminum coating in the cylinders is destroyed by detonation.