On the V8 gearbox the filler Plug Is about 2 inches above the drain plug On the off side of the car Driver-side To Fill I use Piece of horse pipe From inside the car through the gearstick
same on the s6, you directly use the square socket of a 3/8" drive rachet. you might also remove the airbox, you then can fill up via a plastic tube with a funnel from the engine bay ...