Mercedes does do it this way, but the engine set up is different than a Boxster. We fill up in the trunk via a long corregated tube that snakes around to the crankcase.
If you have this thing then give it a try. Don't know anyone who has tried on a 987. But a 987 is like a 986 except for the dipstick. Would also like to see someone try this on a 2007 because the oil fill port changed to be like a Cayman.
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