Remove the bolt, one drop of oil on each bolt lug, distribute evenly with your finger. One drop of oil on the extractor, don't allow oil to go into the firing pin hole on the bolt face. use your finger or a small flat blade screw driver and move the extractor back and forth, wipe off the excess with a clean patch. Extractor can have a little residual oil, bolt face, Dry.
You can use a lite grease if you wish, but I use left over motor oil. Lets not start thick/thin, any motor oil works fine.