HomeAutomotiveOils & FluidsOil & Fluid Additives6 categories in Oil & Fluid Additives, each with one decision: what to buy and why.CategoriesCooling System Additives — AI pick (line): Red Line WaterWetterEngine & Oil Fluid Additives — AI pick: ATP Re-Seal AT-205Fuel System Additives — AI pick (line): Chevron Techron Concentrate PlusHydraulic Fluid Additives — AI pick (line): Lucas Oil Hydraulic Oil Booster & Stop LeakPower Steering Fluid Additives — AI pick (line): BlueDevil Power Steering Stop LeakTransmission Fluid Additives — AI pick (line): Lubegard Automatic Transmission Fluid ProtectantRelated categoriesAntifreezes & Coolants — How to chooseAutomotive Greases & Lubricants — AI pick (line): Lucas Oil Red "N" Tacky GreaseBrake Fluids — How to chooseEngine & Parts Fluid CleanersFlushesOils — How to choosePower Steering Fluids — How to chooseRadiator Conditioners & Protectants — AI pick (line): Red Line WaterWetterRefrigerants — How to chooseTransmission Fluids — How to chooseWindshield Washer Fluids — AI pick (line): Rain-X 2-in-1 Glass Cleaner + Rain Repellent Washer FluidWinter ProductsAll of Oils & Fluids