Light a grill. Lightly brush the ribs with oil and grill over a moderately high fire, turning frequently, until the ribs are sizzling and cooked through, about 25 minutes. Brush the ribs with half of the hoisin glaze and grill for 2 minutes longer. Transfer the ribs to a cutting board and cut in between the bones. Serve the ribs with the remaining hoisin glaze on the side.