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It is caused from excessive engine blowby. You need to find a shop that is very familar with the PCV system. If the engine is Not pulling in fresh air then pressure will build up and it is blown into the air cleaner. Edit by Loosenut: You need to replace the PCV Valve a five dollar part takes five minutes to change without any tools... By replacing the PCV valve and not ensuring the engine is pulling in fresh air does no good other (then) spend your $5.00. Purchase a Haynes Manual and it will explain how the system works. Re-edit by Loosenut: What do you know about manuals? they are just that a manual. they dont explain, injector timing or pulse timing, they just explain what to look for, not what not to look for, just change your PCV valve and you will be ok...... Read my bio page and you will see what I know. I do this for a living and steer people in the right direction for repairs and NOT parts replacement. A repair saves money.

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Q: Why does a 1992 Chevrolet Beretta air filter have oil in it?
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