Back when I owned several air cooled 911's and a 914/6 I quickly learned NOT to use a catch pan with the small openings .......... think Exxon Valdez . Our Boxsters do not have as much volume of oil as an air cooled 911 but I don't trust ANY container with small openings . My Boxster has an extended sump so quite a bit of oil . So does my wifes Volvo XC90 and my diesel dually pickup .
I now have a 2 post lift so I do my oil changes standing up like a human using a conventional shop oil drain rig . But I still keep two open design containers for my diesel garden tractors and similar equipment . Like this one:
I will let the oil cool in the drain pan and then pour into containers that I recycle at local auto parts stores . Letting it cool = less chance of burns .
Is 8" dia opening too small in your opinion? Just came in today and need to make a call.
. Our Boxsters do not have as much volume of oil as an air cooled 911 but I don't trust ANY container with small openings . My Boxster has an extended sump so quite a bit of oil . So does my wifes Volvo XC90 and my diesel dually pickup . 
using a conventional shop oil drain rig . But I still keep two open design containers for my diesel garden tractors and similar equipment . Like this one:
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