I just got myself a new wooden board. I have been told to put some olive oil onto it and let it sink in for a few hours first. But now I'm reading from sources that I should be instead using mineral oil. Which is true? Is it ok to use Olive oil?
Use food grade mineral oil
While one could use any edible oil (assuming frequent washing as many go rancid) to condition a wooden cutting board, food grade mineral oil or "butcher block conditioner," which is food grade mineral oil with waxes, is preferred because it will not affect the flavor of foods cut on the board.
I've been seasoning my boards with olive oil for about 8 years now (same board!) and never had any problems with olive oil making the wood bad, there be a taste or smell.
Now, I do a mild oven dry after saturating it in oil, and then wipe off the excess. I do this once or twice a year.
For the record, we have the board covering one half of our sink and it gets a lot of use, lots of foods, lots of wet, lots of washes in the sink, lots of everything. We put it upright at night to drive if it was washed.
It is a laminated bamboo board.
Olive oil seems to work fine!
PS - I have also done this with one of my previous oak boards.