Where is the Engine Oil leaking in my 2002 Nissan Altima?

[charly]

when my Nissan Altima Engine Oil is leaking, i cant find where it is leaking from i checked the ground, motor but i can't find it.

where else do i look for it.

[essa]

Check for the exhaust when the engine is off just with a finger see if it is oily then you will know where the Engine oil is going and this could be happening due to either the valve seals,Or PVC valve could be defected.