Mercedes M266 4-cylinder engines from 1.5 to 2.0 liters were produced from 2004 to 2012 and were installed only on the compact A-Class model and the similar B-Class compact MPV. These power units were essentially just an updated version of the popular M166 engines.
R4 Mercedes engines: M102, M111, M133, M139, M166, M200, M254, M260, M264, M266, M270, M271, M274, M282.
Specifications
| Production years | 2004-2012 |
| Displacement, cc | 1498 (M 266 E 15) 1699 (M 266 E 17) 2034 (M 266 E 20) |
| Fuel system | injector |
| Power output, hp | 95 (M 266 E 15) 116 (M 266 E 17) 136 (M 266 E 20) 193 (M 266 E 20 AL) |
| Torque output, Nm | 140 (M 266 E 15) 155 (M 266 E 17) 185 (M 266 E 20) 280 (M 266 E 20 AL) |
| Cylinder block | aluminum R4 |
| Block head | aluminum 8v |
| Cylinder bore, mm | 83 |
| Piston stroke, mm | 69.2 (M 266 E 15) 78.5 (M 266 E 17) 94 (M 266 E 20) |
| Compression ratio | 11.0 9.0 (M 266 E 20 AL) |
| Features | SOHC |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no BorgWarner K03 (M 266 E 20 AL) |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 5.0 |
| Fuel type | petrol |
| Euro standards | EURO 4/5 |
| Fuel consumption, L/100 km (for Mercedes A170 2008) — city — highway — combined |
10.2 5.4 7.2 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | 90 |
The engine was installed on:
- Mercedes A-Class W169 in 2004 – 2012;
- Mercedes B-Class W245 in 2005 – 2011.
Disadvantages of the Mercedes M266 engine
- With reliability, this engine is doing great, but it does not tolerate low-quality fuel.
- From bad gasoline, the nozzles and the throttle assembly quickly become dirty here.
- There are a lot of complaints on specialized forums about lubricant leaks and a breakdown of the fuel pump in the tank.
- Another weak point of the motor is the air conditioning compressor clutch and generator.
- Due to the design features, many operations are carried out only with the removal of the engine.
