The six-cylinder in-line engine N53B25 was designed on the basis of the N52B25 and completely replaced it in 2007. The cylinder block, which is made of an aluminum-magnesium alloy, has undergone very minor modifications, the designers have changed the pistons and increased the Compression ratio (now it is equal to 12.0). The head with double vanos was modified, a direct injection system was added. The Valvetronic system was completely removed from the unit. The engine ECU was also replaced – now the motor is controlled by the MSD81 system from Siemens. This unit was installed on the BMW 23i model in the body – E60 / E61.
Specifications
| Manufacturer | Munich Plant |
| Also called | N53 |
| Production years | 2007-2010 |
| Cylinder block alloy | magnesium-aluminum |
| Fuel system | injector |
| Configuration | inline |
| Number of cylinders | 6 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 78.8 |
| Cylinder bore, mm | 82 |
| Compression ratio | 12 |
| Displacement, cc | 2497 |
| Power output, hp | 190/6100 / 190/6300 |
| Torque output, Nm / rpm | 235/3500-5000 / 240/3500-5000 |
| Fuel type | 95 |
| Euro standards | Euro 5 |
| Weight, kg | — |
| Fuel consumption, L/100 km (for 116i E87) — city — highway — combined |
10.0 5.7 7.3 |
| Oil consumption, gr/1000 km | up to 1000 |
| Recommended engine oil | 5W-30 / 5W-40 |
| Engine oil capacity, liter | 6.5 |
| Oil change interval, km | 10000 |
| Normal engine operating temperature, °C | ~95 |
| Engine lifespan, km — official information — real |
— ~250-300 |
Frequent problems
The power unit N53B25 does not have significant problems, wear and tear of the high-pressure fuel pump is typical for it, the use of not the most reliable ignition coils and high-pressure injectors. The high pressure fuel pump has a resource of 100 thousand kilometers. Candles need to be changed after 10 thousand kilometers. The resource of the ignition coils is 50 thousand kilometers, high-pressure injectors are changed every 100 thousand kilometers.
When operating the N53B25 engine, it should be borne in mind that the motor is picky about working fluids. It is better to use the oil recommended by the manufacturer and fill with quality gasoline. It is necessary to ensure constant monitoring of the state of the cooling system, to regularly clean the radiator so that the problem of overheating of the power unit does not appear. The motor has no problem with increased oil consumption. Correct and timely maintenance of the engine contributes to an increase in the resource of the unit.
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