Some vehicles have more issues with this than others... I remember when
I was a little kid my parents had a Ford Pinto (actually not a bad car,
despite the reputation) which had the 2.3 OHC motor - one day my mom
took it to the grocery store and apparently while it was in the parking
lot some unsavory character who must have had a similar car STOLE THE
OIL CAP. (no inside hood release on that car)  It was evident within a
couple miles as there was enough oil splash off the camshaft to make
lots of stinkiness.

Similarly, I used to have an old Scirocco with the 1.8 engine.  I
parked it for about 6 months one time as I just didn't have the time or
money to fix it but I did have another car.  when I went to move it, it
fired right up but the seal on the oil cap had apparently dried out
from not getting its regular daily soaking in oil.  Even with the cap
on, enough oil splash came off the cam and out the cap to make a big,
smoky mess.  I understand that later cars had a baffle over the cam to
control this.  A new cap from the dealer fixed it right up.

nate