What would cause oil build up in the air fliter on a 2.5 chevy 4 cyl?

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genlee69rt01

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I have a 2.5 four cylinder, m5 speed, 1991 chevy s-10 that constantly clogs the air filter with oil. It has 70,000 miles and gets serviced regularly. It seems to be coming from the rear breather inlet (the rubber hose that comes from the valve cover to the rear if the air filter housing). The breather and air filter needs changed about every two weeks. The pcv value, when shaken, makes noise, so I think it's working okay. Any ideas????
 
Change that PCV valve anyways. Something may be inside it blocking it from working properly. Also make sure you hadn't overfilled, or someone overfilled the oil.
 
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