Brush grill rack with oil. Drizzle olive oil onto skin-side and top of salmon; sprinkle generously with salt and fresh cracked pepper. Place salmon on preheated grill, skin-side down. Grill salmon uncovered 5 minutes. Using 1 or 2 large spatulas, carefully turn fish over. Grill until fish just begins to flake in center, 4 to 5 minutes longer. Transfer salmon to platter and serve immediately.