Water Based. Special Corrosion Inhibitors (Protects Unpainted Metal Surfaces). Prevents Rusting Or Sedimentation. Excellent Parts Cleaner And Degreaser.The Revet Engine 5L Nitro Is A Powerful Solution For Effectively Degreasing Engines And Leaving Them Spotless And Renewed. Specially Formulated With The Strength Of Nitro; This Engine Cleaner Provides Superior Cleaning Performance; Making It A Must Have For Automotive Enthusiasts And Mechanics.