Well... Cunegonde's co-owner put 2qts of oil in an all ready full 1.9l WBX engine. 
Huge clouds of dark smoke everywhere, 
oil squirting from somewhere near the driver side cylinder head onto the exhaust manifold, 
oil clouds coming out of the head/exhaust header joints,
oil coming out the tailpipe. 

Engine will run but not going to risk a fire! 

Now that Cunegonde's towed home, what's the prognosis?
Engine has about 45k miles.
No oil in the coolant.
I've drained the excess oil from the pan; if there's a chance it will run again, will empty and refill completely and change filter.

Next step... Remove a head and examine it and the gasket for damage? What else to check? 
Also, clean engine & exhaust headers thoroughly in hopes most of the smoke was hot headers?

If repair is in excess of 12 hours of work, or if engine will be even less reliable than usual, we're prepared to install a VW inline 4 or Subaru replacement engine.