Don't add so much oil. You only need enough to wet the internal parts.
I just thought up a harebrained scheme which I never tested on my oil-port-equipped Shimano 333s. You could add a few drops every few months, then gently turn the cranks in each gear, then leave the bike tilted 45 degrees toward its right side with a rag wrapped between the sprocket and spokes and another between the sprocket and frame. And promptly wipe it down after its first ride after oiling.
Last edited by garage sale GT; 07-03-09 at 08:36 PM.