Add sour cream, mayonnaise, lime juice, olive oil, garlic, and salt to a food processor. Blend until combined.
Add the cilantro and blend until mostly smooth, leaving a few small pieces of cilantro for texture.
Notes
To make without a food processor: Finely chop the cilantro. In a bowl, whisk together the sour cream, mayonnaise, lime juice, olive oil, garlic, and salt. Stir in the chopped cilantro.