demento... I like your way of thinking man! Need a hole for the fill as well to make it a good quick lube mod.
I would ask the dealer and see if it would void the warrantee. It may. Please post the answer. I'm curious what they would think, but just know they (the World Rally racers and Subaru) may market your idea. Pit stop oil change 15 seconds with the right gear.
oohh... Why am I responding to this...?