Stu, what kind of oil are you using? Boiled linseed? Bore oil? What's the concern about getting oil on the satin body? It shouldn't affect anything.... Sorry, just wondering.
I'm guilty of posting before I've read all posts, but
excellent point. Before I saw this I was simply thinking "I never worried about getting the edges of the bridge because the oil's gonna permeate the edges over time, anyway."
Maybe somebody's already mentioned it.
Re bore oil, probably fine, what's important is that all oils have volatile aromatic impounds that help 'em dry out, some better than others. It's the stuff that give lemon oil have it's flavor. Or walnut oil. The VoAC's can be strong enough to be solvents in their own right, take concentrated lemon oil for example. Why furniture polish is actually very low percentage of actual lemon, and all buffered up and waxed up so it polishes up nice.
But that's why furniture polish builds up: the wax.
And note lemon oil's specifically recommended
against use on maple fretboards.
Walnut oil's supposed to have a high percentage of very high volatility aromatics, means it would dry even quicker, and not as potentially damaging as lemon oil.
Bore oil's volatility (drying speed) is enhanced by using petroleum distillates, they evaporate
really fast.
I gotta admit my Guitar Honey's got pd's and a lot of commercial products do too, so now it's only "do you want to use a natural oil or are ok with man-made treatment oils?"
Re factory fretboards "oiled?" question:
I believe that yes in fact 'boards were given some kind of light initial final treatment (probably the linseed oil?) and even saw a comment that a carnauba wax buffing was the final step to seal it, at at least some points during Westerly.
It stuck with me because it corroborated the marvelously smooth finish the (D25's, and all of 'em in fact) 'board had when new, and still have pretty much, with an occasional treatment of Guitar Honey, maybe once every 18 months?
And clean the 'board when I change strings with maybe just a wet cloth, don't let the grunge build up, that's maybe once a year on a given guitar.