The air filter helps to keep the dirt and debris away from the combustion chamber. Sometimes, the engine oil comes in contact with the air filter because of damaged piston rings, blocked oil passages, and clogged positive crankcase ventilation valve. See the mentioned slideshow to know the reasons for engine oil inside the air filter.

2. The air filter is the
modern combustion
engine located inside the
air intake housing for
capturing the dirt, debris
and other contaminants
of the car.

3. It contains the fuel
injection system which
can remove the dirt,
debris, dust particles and
impurities before the air
mixed with the gasoline
to become vapor.

4. When the air filter is
clogged with these
contaminants, it will
affect the fuel efficiency
of the engine and
decrease its power.

5. If the engine oil gets into
the air filter, then it will
significantly impact the
performance of the
engine and need
immediate repair.

6. The following points
define the reasons
behind the engine oil
enter into the air filter
of your car.

7. Damaged piston
rings

8. The damaged piston
rings can cause engine
oil leaking into the air
filter housing which is
installed at the outer
edge of the piston
inside the combustion
chamber of the car.

9. The well-working
piston rings can create
combustion ratio and
allow the engine oil to
lubricate the
combustion chamber
during each piston
stroke.

10. When the rings are
worn out or damaged,
then it can loosen and
cause oil blow means a
blue smoke coming
from the car's tailpipe
while driving.

11. Due to the worn out
piston, the excessive oil
blow can cause
pressure inside the
crankcase and send
more oil through the
PCV valve and into the
air filter.

12. Blocked oil
passages

13. The blocked oil
passage of the car is
another possible
reason behind the
engine oil get into the
air intake system.

14. When the engine oil
and filter are not
replaced as per the
recommendation of
manufacturers, the oil
enters into the air
filter.

15. It generally occurs
when the excessive
carbon deposits inside
the crankcase as well
as engine sludge
developed in the
crankcase.

16. When the oil unable to
flow efficiently, then
the excessive engine oil
pressure will be created
and the extra oil
pushed through the
PCV valve and air
filter.

17. Clogged positive
crankcase
ventilation valve

18. The PCV valve of the
car is connected to the
air intake housing
through a rubber
vacuum hose and used
for releasing the
vacuum inside the
engine's crankcase.

19. The PCV valve is
installed on the top of
the cylinder head valve
cover in which the
pressure flows from the
engine through the
cylinder head and exit
into the air filter.

20. It is similar to the
engine oil filter and
clogged with the
excessive debris over
time. As a result, it
needs immediate
replacement as per the
recommendation.

21. If the PCV valve of the
car is not replaced as
per its recommended
time, then the excessive
oil will blow through
the PCV valve and
enter the air filter
system.

22. Conclusion

23. If you are performing
the routine service of
the car, then you can
easily determine the
engine oil inside the air
filter or the air intake
housing of the car.

24. So, check your car by a
professional mechanic
on a regular basis for
identifying the
necessary repairs of
the car.

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