Place the oyster crackers in a gallon resealable bag or a container with a lid. Whisk together the vegetable oil, ranch seasoning, garlic powder, and dried dill. Pour the seasoning mixture over the crackers.
Gently mix the crackers with the seasoning mixture. Over the next 5 minutes or so shake and turn the bag over until all the oil has been absorbed into the crackers. Transfer them to an airtight container.
Notes
Store them at room temperature in an airtight container for up to 4 weeks.