your answer is NO...
Removing the oil cap with the engine running causes a vacuum leak in the positive crankcase ventilation. This causes too much air to enter the cylinders at once, which results in a stalling engine.
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.
1 If the oil leak is large enough the engine maybe running low on oil and the pistons are getting to hot and expanding in the cylinders and would cause them to stick to the cylinder walls slowing the vehicle and eventually they will weld together. The wheels may lock very dangerous! 2 Or the oil leak maybe oil leaking into the cylinders and fouling the spark plugs. If you pull the spark plugs out and they are full of black soot oil is getting into the cylinders. Generally this is by way of a cracked engine block or a leaking Headgasket. Oil in the cylinder fouls the plugs and causes a loss of power. Either is Serious NEVER drive low on oil. If you did drive while the car was Very low on oil #1 is probably your problem.
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.
There are a number of places an Oil Leak can occur take your pick.
they leak oil from the oil pump on the front of the engine
Identify the origin of the leak, and repair accordingly. E.g., if it's the oil pump, reseal or replace it. If it's the oil pan gasket, replace the gasket. If it's blowing through the scraper rings on the cylinders and out the exhaust, it's probably a good time to rebuild the engine. What kind of answer are you expecting? WHERE the engine oil is leaking from matters.
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.