I don't leave any oil in the trigger group, I just spray some 90% alcohol into it. That washes out dirt and drys without residue. You could put a tiny drop of synth where the trigger/sear meet, but that's not needed imo. Just something to 'collect' dirt. Bolt actions keep the group pretty clean otherwise, not a lot of powder blown in. And I've got the Accu-spring screwed in as tight as possible, about 1-1.5 # trigger that's very crisp.
* Forgot to say, I do this both in my Sav-64(NO A-T, about 3-4# trigger) and B-22 w-A-T.