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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 .

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    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
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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.

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