I avoid Canola Oil, after googling it up - it's one of those things that has it's lovers and haters - depending on whether you believe one side or the other. But after seeing what <doesn't> happen to Canola-based peanut butter (it hasn't changed state, decomoposed or attracted bugs or any other vermin when left out for one year!) - I choose to avoid it.
So, I use olive oil or corn oil.
I'm starting to go more 'natural' on many foods. Started late in this, but getting better. Feeling better too.