I don't know where the oil goes, they aren't greasy! We sneak this into the theater and eat it while watching movies at home. A great party food, easy and can be made in advance.
Place the oil and ranch dressing mix in a jar and screw on the lid. Shake until mixed and pour over the other ingredients. Let sit for 30 minutes and then serve. You can add 1 cup of rice chex and 1 cup of small pretzels as well.