Turbo is right, I highly doubt that the blow by gasses would be able to travel agains the air flow to get to the filter.
You want to check for blow by in one of these cars, look at the butterfly valve in the throttle body and the latter part of the intake hose.
I replaced the front O2 sensor to fix that one.
But, when I got the diagnostic printout there were like 13 different things that could have been wrong.
Your results may vary.
Funny, I know some guys from college who were studying aquaculture and they used to get some males together and have fights with them and take bets.
Did you know that they can be sent through the mail as long as the envelope is kept damp??
The first thing I thought of when I saw that picture was new Jetta, or maybe Passat. Pur your hand over the front of the car and tell me what you think.