There are a number of places an Oil Leak can occur take your pick.
An oil leak is always going to be out of the engine as the engine contains oil and the car does not. I think you are saying you are loosing oil with no apparent leak. If that is the case the engine is burning oil and that is why you see no leaks.
engine oil leak
If you have an engine oil leak on your 2002 Peugeot 206 1.4, you can use an oil stop-leak product to fix it.
they leak oil from the oil pump on the front of the engine
your answer is NO...
Oil leaks can be hard to find. Wash the engine good. Keep the oil filled, and look daily for signs of oil, even underneath the engine to see where the leak is.
u will blow your engine oil seals, causing an oil leak and damage to the engine.
Oil pressure as measured by the guage on the dash is usually a measure of the pressure put out by the oil pump and not an indication of a leak or low engine oil level. If you have a leak your best indication of that will be puddles on the ground, on the underside of the engine or a milkiness looking color in the oil (as seen on the dipstick) or in the engine coolant.
You can use an oil stop-leak product to stop an oil leak on your 2002 Peugeot 206 1.4.
you can take oil and put it where you suspect there to be a vacuum leak. If there is a leak the oil will be pulled into the engine or hose
the signs of a valve cover leak are oil on the engine oil is the only thing that can leak from a leaky valve cover
It will continue to leak oil and if you do not add oil regularly it will eventually cause engine damage.