Oil and air filter?

Changed the air filter last night and found oil in the air filter housing. What do I need to do to fix it. 98 3 cylinder

9 times out of 10, it's your PCV valve. Other 1 means your piston rings are gone. Shouldn't be true in a 98 tho. I'd just replace the PCV

Thanks

posted that on his other thread...i was correct this time!! cool beans

just to be safe.do a compression test do the oil squart second time if rises rings