I ordered a beautiful steak and prawn salad for lunch.
I asked my husband to ask for no oil and no dressings. The waitress came over to kindly inform me they coat their steaks in oil prior to cooking and that all steaks were pre oiled. This came as a surprise to me.
I had to ask them to dig a steak out from their fridge that wasn't oiled. They kindly did this for me, but it serves as a warning not to take for granted that all restaurants use no oil.
Always check and always ask.