Jerk Marinade

6 tablespoons vegetable oil, divided 1/4 cup fresh lime juice 4 scallions, coarsely chopped 4 Scotch bonnet or habanero chiles, stemmed, seeded, coarsely chopped 3 garlic cloves, roughly chopped 2 tablespoons fresh thyme 1 tablespoon minced peeled fresh ginger 1 tablespoon (packed) dark brown sugar 2 teaspoons allspice berries 1 teaspoon kosher salt plus more 1/4 teaspoon freshly ground black pepper 2 tablespoons distilled white vinegar Ingredient Info: Habaneros and Scotch bonnets—extremely hot chiles—are available at better supermarkets and at Latin markets