Royal Purple 06512 Synchromax Manual Trans Fluid Case 6x1qt Bottles, 192 Ounces Recommended for manual transmissions that specify an automatic transmission fluid Ideal for 4x4 transfer cases and motorcycle gear boxes The top synthetic transmission fluid for protection and an all-around smoother ride Fully compatible with all types of friction materials Provides excellent corrosion and oxidation protection without affecting the soft metals commonly found in manual transmission synchronizers