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I've noticed that my car has been using oil. So I checked everywhere for leaks and found nothing. Until today when I checked my air filter it looks like it's coming in through the pcv tube. I'm just curious as to what is making it do this. Is there something wrong with the engine? Any help would be great.
 

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BTW did you notice any oil consumption, any leakage too. any performance issue
anyways i attached the service procedure for replacing the PCV tube
also the diagnosis of it. here is the most important part

If oil has accumulated in the intake air duct, inspect for the following conditions:

- Plugged vacuum orifice in the crankcase ventilation housing
- Plugged or restricted crankcase ventilation housing
- Excessive crankcase pressure or blow-by, refer to Oil Consumption Diagnosis .
• Additional items to inspect:
- Plugged or leaking fresh air vent hose assembly or vent adapter
- Plugged or restricted passages in the throttle body
- Missing or damaged O-ring seals on the vent adapter
- Inspect the cam covers, the oil pan gasket, and other sealing areas for leaks
 

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Are you saying your air filter has oil on it? Because if it is just in the box AFTER the filter and before the throttle body, then a little bit is normal. Most of these cars start using oil in some capacity after 60K-80K. Seems like part of the design (insert some sarcasm) as most get the consumption.
 
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