In a medium bowl, mix soy sauce, italian dressing, barbecue sauce, vegetable oil, garlic, steak seasoning, seasoning salt, salt and ground black pepper. Place steak in the mixture. Cover and marinate in the refrigerator 12 hours, or overnight. Turn the steak once during marination.
Preheat an outdoor grill for medium-high heat and lightly oil grate.
Cook steak on the prepared grill 5-7 minutes per side, or to desired doneness.