Why is there oil in the intake manifold of my demio engine zj? I have checked the valve seals are ok and piston rings also ok .

  • 1
    Welcome to the site. Please use the edit feature to add details about your vehicle. Year/Make/Model, mileage, etc. Also, how much oil is present? Without details, all we can go is make general broad guesses. – CharlieRB Mar 16 '18 at 14:21

Usually because a small amount is passed via PCV (positive crankcase ventilation) into the manifold. This is standard on most engines now to control emissions.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.