Does olive oil make your hair oily even after you've shampooed it?

i read online that olive oil makes your hair shiny and moisturized, i wanted to try it but someone told me that even after i shampoo it out, it will still be in my hair for a few days. has anyone done this before? and can you tell me if it makes your hair like oily for a few days? if i were to shampoo it out of my hair, how many times would it take for it to get out?