E70 3.0d 2007 - increased fuel consumption

[bodek_wr]

Hello,

I'musing my X5 for almost 8 years. Over a year ago I've observed, that fuel consumption has increased. I had the oil leak from intake manifold. Month ago I've replaced and sealed it. But still the fuel consumption is too high (on highway, with 120km/h it was 8l/100km now 10l/100km). Additionally I found that exhaust is covered with black dry soot. I assume not enough air is delivered to motor. Computer is trying to keep power by increasing fuel.
What I have checked:
On idle
Correction injection quantities from smooth running regulator in [mg/stroke]:
Cylinder 1: 0.5
Cylinder 5: -0.2
Cylinder 3: -0.1
Cylinder 6: -0.6
Cylinder 2: 0.2
Cylinder 4: 0.1
OK: -5.0 to 4.0
Critical: Rate < -5.0 or > 4.0

with 2000 rotat.
Message
Duration: 0 Minutes 0.05 Seconds (14:37:45.826 ... 14:37:45.874 )
Correction injection quantities from smooth running regulator in [mg/stroke]:
Cylinder 1: 1.3
Cylinder 5: -0.5
Cylinder 3: -0.4
Cylinder 6: -0.8
Cylinder 2: 0.1
Cylinder 4: 0.3

Boost pressure = ambient pressure ±25 mbar
Actual values:
Boost pressure: 1017mbar
Ambient pressure: 994mbar
Difference: -23mbar

Measured values, mass air system:
Engine speed: 696 rpm
Injector volume: 7.0 mg
Air mass, actual value: 360.2 mg
Air mass, target value: 377.6 mg
Activation, EGR valve: 65 %
Boost pressure, actual value: 1017 mbar
Boost pressure, target value: 1011 mbar
Activation, boost pressure actuator: 95 %
Intake air temperature: 41.7 °C
Charge air temperature: 45.2 °C
Message
Duration: 0 Minutes 0.04 Seconds (14:59:33.776 ... 14:59:33.810 )
Measured values, mass air system:
Engine speed: 818 rpm
Injector volume: 2.4 mg
Air mass, actual value: 459.5 mg
Air mass, target value: 397.0 mg
Activation, EGR valve: 77 %
Boost pressure, actual value: 1132 mbar
Boost pressure, target value: 1003 mbar
Activation, boost pressure actuator: 95 %
Intake air temperature: 39.7 °C
Charge air temperature: 46.2 °C

Rail pressure:
Ciśnienie na listwie common rail:
Message
Duration: 0 Minutes 0.05 Seconds (14:59:37.314 ... 14:59:37.362 )
Measured values, rail pressure control:
Engine speed: 704 rpm
Coolant temperature: 85.5 °C
Injector volume: 7.1 mg
Rail pressure, actual value: 270.3 bar
Rail pressure, target value: 270.0 bar
Activation, pressure control valve: 25.9 %
Activation, volume control valve: 39.7 %
Intake air temperature: 39.2 °C

The values are looking ok, so what's more I should check?
The maximum power and torque is correct (presented on sport display):
~230KM and ~500Nm.

It looks like the computer is giving too much fuel constantly, independently of the motor speed (always like 20% more fuel).

DPF is clear.

Any advice is welcome

best regards

Maciek