It wasn't the air hole, or the dropped drain plug, it's the type of pan used. Whether you'd opened the air hole, or not dropped the plug, you'd still have had a hazmat disaster using those type of pans.
The Boxster drains oil VERY fast, much faster than any of the 'take it to the recycle center' type of pans can handle... it will inevitably overflow as the oil comes out faster than it can go in.
I use a fairly standard pan like this -
Then I transfer the used oil to a covered 5 gal. kitchen pail to take to recycling.
