Depends if you're talking about the oil, or the grease...
Oil, just stick a few drops in your asa/macroline, take the barrel off and dry fire it 30ish times, then wipe the excess oil off the bolt.
the only way you could grease it without dismantling it would be to apply the grease to the parts visible through the breech. But I'm not sure how effective this would be. Tom Allen would be your best bet for telling you.