I bet that you could make a tool to do the job without too much trouble.

You'll have to see one first in order to copy it.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

I believe that I could do it if I had an example of the pan (which could mean the whole car) to examine. All you need is a hose that seals to the opening, and is long enough to come out the side of the car to a funnel.