I used the Salix bat wax on the back of a bat after all stickers came off for a refurb and oiling made the outlines of the stickers visible again. I won't be oiling the back again!
yeah I always oil the back too as it locks in the moisture content and also protects the wood
This^^^
as others have said all exposed areas should be oiled (except the splice). it adds little to no weight at all and keeps the moisture in the bat. why wouldnt you oil the back?
Always oil the bare parts. I usually oil my bats before I put a scuff sheet on, just so the colour of the wood is the same throughout the bat!
I don't know, but I'm sure I've read in a few places that you don't oil it...