BMW N55, Manual, Page: 38 / 100

Note: If a customer complains about high oil consumption and oil is
discovered in the turbocharger, it should not be immediately assumed
that the turbocharger is defective. If the oil is present in the fresh air pipe
(before the turbocharger) then the entire engine should be checked.
Index Explanation
A
Excess pressure
B
Vacuum
C
Exhaust gas
D
Oil
E
Blow-by gas
1
Air cleaner
2
Intake manifold
3
Impact plates
4
Oil return channel
5
Crankcase
6
Oil sump
7
Oil return channel
8
Exhaust turbocharger
9
Oil drain valve
10
Charge air intake line
11
Hose to charge air intake line
12
Non-return valve
13
Pressure regulating valve
14
Throttle valve
15
Non-return valve
16
Passages in cylinder head and cylinder head cover
38
N55 Engine