I'm curious now...

We know that Obliviation doesn't erase everything - it erases memories but not every effect of the experience it erases. We've even seen it in story - Rianne Felthorne felt sad when looking at her "found" ruby. McGonnagall also hypothesized that Harry might have been abused(or otherwise experienced something awful) and then Obliviated.

Either way, I'm curious how this effect would interact with something like this.

If Harry told you the secret of the True Patronus(and you weren't the sort of person who could kill Dementors with that knowledge) and you Obliviated yourself, would that be enough to restore the capacity to use an animal Patronus?