Moyer Marine also sells an oil change kit that mounts permanently to that drain plug I spoke of. Then, when its oil change time, you just hook your
pump and bucket up to the oil change hose and you're ready to
pump out the oil.
I'm thinking of getting one for my A4.
Moyer Marine Online Store
You can always just
pump the oil out thru the dipstick, but you run the risk of not getting all the oil out. From the oil drain plug, you can almost get every last drop out.