Whisk together the oil, vinegar, oregano, and salt.
Put tomatoes in a medium sized bowl and pour dressing over top. Add basil and toss gently. Put the lid on or plastic wrap and refrigerate for at least two hours or overnight.
Toss gently. Add more salt if necessary and serve.
All nutritional information provided is an estimate. For specific dietary needs or concerns, we recommend consulting a nutrition calculator or a qualified expert.