General de Gaulle had a 1962 Citroën DS that developed an oil leak and the OAS was certainly blamed for that one. ;-)
Seriously though, it might be a good idea to wash the engine down so you can see where the leak is coming from. Once it is clean except for the leak it will be clear as day looking at it from underneath whilst on a hoist. There is a hose that connects to the left side of the crankcase, crosses over to the right side under the intake manifold and plugs in to the bottom of the AOS. The oil filler tube is another suspect. A failed AOS is still a sealed unit and would just spray oil into the air intake causing MASSIVE amounts of smoke out of the exhaust.
What you are experiencing sounds like a broken hose somewhere (these are hard plastic vacuum hoses that become brittle with age and crack easily) and will be an easy and inexpensive fix once you can find it.
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