How many days can you store oil and vinegar dressing with no refrigeration?

It depends on the type of oil in the dressing. While oil and vinegar are both shelf-stable at room temperature, some oils (like olive oil and avocado oil) can become rancid more quickly than others (like canola oil and safflower oil). A good rule of thumb is to store oil and vinegar dressing at room temperature for no longer than 2 weeks. If the dressing contains any other ingredients that could spoil, like herbs, spices, or other vegetables, it should be stored in the refrigerator and consumed within a week.