One of those questions like whats the best patch lube when shooting a muzzle loading rifle.

What ever works the best for you.
All have been tried and all have given good results (in the eye of the finisher at least),, or you wouldn't see them touted as 'the best way' to do something.

The one I really can't figure is the used motor oil with all the junk chemicals and grit that's in it.
But seems someone always has to try it and wheel bearing grease and if you don't have much else,,I'd guess it'd do.

Linseed, G-96, Clezoil, Remoil, ect. I've used them all and many many more. They all work. Clezoil is the fav of the moment now for me.
More important is to make sure there's nothing left on the steel surface underneath it to cause after rust. The oil won't prevent that.

Oil away with your favorite stuff. There's no voo-doo science to it.
It won't be the last wipe down the bbl gets.
It just happens to be the first after being completely oil free during the blue process.