Preheat the oven to 350 degrees.

In a very large mixing bowl, toss together the cereals and pretzels. Set aside.

In a small mixing bowl, whisk together the oil, dill, garlic, and ranch.

Pour the oil mixture over the cereal mixture and toss to coat. Be sure to continually toss the mixture together so that each and every piece is coated with the oil.

Spread evenly on a baking sheet (I used two baking sheets; it depends on how large your baking sheets are; a single layer is what you should strive for.)

Bake for 20 minutes, tossing at the 10 minute mark.

Transfer back into the large mixing bowl, which has been wiped clean, to cool.

Store in an airtight container.