I subscribe to Consumer Labs where they test products and write honest reviews. I do this for supplements as well. Feel free to reach out if you are curious about a product. If they have tested it I will send you the best possible choices so you know you are getting a quality product. They are not paid for their reviews. I use olive oil frequently for salad dressings and marinades. Here are the top picks that passed testing listed below.
There are other brands that I have used and loved but they have not yet been tested. You can subscribe to Consumer Lab here.