Combine roasted garlic teriyaki sauce, brown sugar and oil, stirring until sugar dissolves. Pour mixture over chicken in large plastic food storage bag. Press air out of bag; close top securely. Turn bag over several times to coat chicken. Refrigerate 2 hours, turning bag over once. Remove chicken from marinade; discard marinade. Grill chicken 4-5 inches from hot coals 12-15 minutes, or until chicken is no longer pink in center, turning over occasionally.