Grease a large brown paper grocery bag with vegetable oil and set aside.
Heat oven to 350 degrees F.
Wash the turkey and pat dry with a paper towel.
Combine 1/4 cup of vegetable oil, seasoned salt, garlic powder, liquid smoke
and black pepper and mix together to make a paste. Rub the turkey well with
the paste, inside and out.
Place the turkey in the greased bag and tie the bag closed with a piece
of string. Place on a baking sheet and roast for 3 1/2 hours.
Remove from the oven and let stand at room temperature for at least 30 minutes
before untying the bag and removing the turkey.