Here is a detailed description of the BMW 3-Series E90 / 5-Series E60 equipped with the 2.5L N52 engine and ZF 6HP19 automatic transmission:

 

Engine: BMW N52B25 (2.5L Inline-6)

• Type: Naturally aspirated inline-6 petrol engine
• Displacement: 2,497 cc
• Valvetrain: DOHC, 24 valves
• Fuel system: Direct injection or port injection (depending on model year/market)
• Valvetronic: Yes (variable valve lift)
• Double VANOS: Yes (variable camshaft timing)
• Power output:
  
• Approx. 190218 hp (140160 kW)
• Torque: 230250 Nm
• 
  
• Engine code:
  
• N52B25 / N52B25UL (lower power version)
• N52B25O0 (higher output version, often in E60)
• 
  
• Materials: Magnesium-aluminum alloy engine block (lightweight)

 

Transmission: ZF 6HP19 Automatic Gearbox

• Manufacturer: ZF Friedrichshafen AG
• Type: 6-speed automatic transmission
• Model: ZF 6HP19
• Torque capacity: Up to 400 Nm
• Gear ratios:
  
• 1st: 4.17
• 2nd: 2.34
• 3rd: 1.52
• 4th: 1.14
• 5th: 0.87
• 6th: 0.69
• Reverse: 3.40
• 
  
• Features:
  
• Mechatronic integrated control unit (TCU + valve body)
• Adaptive shifting logic
• Smooth shifting with torque converter lock-up
• Compatible with manual shift mode (Steptronic)
• 
  

Fitment:

 

BMW E90 (3-Series)

• Models: 323i, 325i, 325xi (varies by market)
• Years: ~20052011

 

BMW E60 (5-Series)

• Models: 523i, 525i, 525xi
• Years: ~20052010

Known Notes:

• ZF 6HP19 is known for reliability if well maintained (fluid/filter every ~60k80k km).
• The N52 engine is reliable but may have issues like:
  
• Valve cover gasket leaks
• Water pump (electric) failure
• Oil filter housing leaks
• DISA valve wear (on intake manifold)
• 
  

Let me know if you want a half-cut or spare parts description for this setup.