The N53B25 inline 6-cylinder engine represents the N53 family (also includes the N53B30), developed on the basis of the N52B25 and in 2007 was intended to replace the raw predecessor. The cylinder block remained the same with minimal changes, the pistons changed and the compression ratio increased to 12. The cylinder head with Double-VANOS was finalized, a direct fuel injection system appeared, and the Valvetronic valve lift change system disappeared. The engine control system has changed, now Siemens MSD81 is used instead of Siemens MSV70, otherwise the motor is the same. This motor was used on BMW cars with the 23i index.
N53 family: N53B25, N53B30.
Specifications
| Production years | 2007-2010 |
| Displacement, cc | 2497 |
| Fuel system | direct injection |
| Power output, hp | 190 |
| Torque output, Nm | 235 – 240 |
| Cylinder block | aluminum R6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 82 |
| Piston stroke, mm | 78.8 |
| Compression ratio | 12.0 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | double VANOS |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 6.5 |
| Fuel type | petrol |
| Euro standards | EURO 5 |
| Fuel consumption, L/100 km (for E60 523i) — city — highway — combined |
10.0 5.7 7.3 |
| Engine lifespan, km | ~275 000 |
| Weight, kg | 155 |
The engine was installed on:
- BMW 5-Series E60 in 2006 – 2010.
Disadvantages of the N53B25 engine
- Most of the problems with this unit are related to the direct fuel injection system.
- From bad gasoline, piezoelectric injectors and their high pressure fuel pump quickly fail.
- After a long stop, faulty injectors can cause water hammer in the motor.
- Also, owners of cars with this engine often change spark plugs and ignition coils.
- On runs over 100,000 km, the Vanos phase control system often requires repair.
Frequently asked questions about the BMW N53B25
How much power does the BMW N53B25 make?
The BMW N53B25 develops 190 hp and 235 - 240 Nm of torque.
How much oil does the BMW N53B25 take and which one?
Engine oil capacity: 6.5 liters. Recommended oil: 5W-30.
Does the BMW N53B25 have a timing belt or chain?
The BMW N53B25 uses a timing chain.
Is the BMW N53B25 turbocharged?
No, the BMW N53B25 is naturally aspirated.
Does the BMW N53B25 need valve clearance adjustment?
No, the BMW N53B25 has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the BMW N53B25 last?
The typical lifespan of the BMW N53B25 is ~275 000 km with proper maintenance.
What is the fuel consumption of the BMW N53B25?
E60 523i: city 10.0, highway 5.7, combined 7.3 L/100 km.
What cars was the BMW N53B25 installed on?
BMW 5-Series E60 in 2006 - 2010.
What are the common problems of the BMW N53B25?
Most of the problems with this unit are related to the direct fuel injection system. From bad gasoline, piezoelectric injectors and their high pressure fuel pump quickly fail. All known problems.
What engines are related to the BMW N53B25?
N53 family: N53B30.
