Prophet (PBUH) which oil did he use?

I read somewhere that the Prophet (PBUH) used to use olive oil in food and for skin because olive tree is a blessed tree. Can anyone back this up?

I always thought that as a moisturizer and for hair... Coconut oil > Olive oil but now I'm not so sure.

Hmmm. I thought it was black seed oil.(Kalonji)
I'm not sure what its used for but i have heard of it being associated with the prophet (pbuh).

Interesting I've not heard that before, any other ideas?