Top 20 Best Selling Cooling System Additives (2019)




Purple Ice is a high performance, synthetic, radiator coolant additive. It reduces engine heat by reducing the surface tension of the radiator fluids for improved heat transfer. Purple Ice fosters optimum coolant flow by helping to prevent formation of sc ... more info

How does it work? Red Angel is inert until it mixes with R-134a. Red Angel is activated by air flow at the site of the leak - forming a chemical weld and repairing the system. How large of a leak does it repair? Red Angel will seal leaks in A/C systems ... more info


Reduces wear, noise and chatter in limited slip (Sure-Grip, Trak-Lok, Power-Lok) differentials. Should be added whenever the gear oil is changed or improper limited slip operation is detected. ... more info


Prestone Flush 'N Fill Kit professionally back-flushes cooling systems of most cars and light trucks on the road today. Easily installs anti-freeze/coolant in minutes. ... more info




The Blue Devil Engine and Cooling Sealant has the remarkable ability to repair and seal leaks in freeze plugs, leaking radiators and heater cores, cracked or warped heads and fix most blown head gasket by forming a permanently seal. The Blue Devil Engine ... more info



Bar's Leaks Head Gasket and Cooling Sealant repairs blown head and intake gasket leaks. Seals cracked cylinder heads and blocks. Stops heater core and radiator leaks. Fixes leaking freeze and core plugs. ... more info

Kool-It 96001 Supreme Coolant Treatment Kool-It 96001 Helps Engines Run Cooler Stray Electrical Current Can Cause Excessive Corrosion of Metal Componets Stray Electrical Current Can Cause Electrochemical Reaction That Will Produce Voids in Tubes Is ... more info



RMI-25 is a low-cost, effective safeguard against cooling system failure. It cleans while you drive; inhibits rust, cavitation erosion, electrolysis and pitting; lubricates water pump seals and thermostats; and improves cooling. RMI-25 should be at work a ... more info


Bar's Leaks DiFM 5-gram Cooling System Treatment seals internal, external and coolant to oil leaks. Stops radiator tank seal leaks. Inhibits the formation of rust and scale. Helps control electrolysis and helps neutralize pH imbalance. Lubricates water pu ... more info


Lucas Oil Heavy Duty Oil Stabilizer is a 100 percent petroleum product formulated to eliminate dry starts and reduce friction, heat and wear in any type of engine. It allows motor oils a higher degree of lubricity which reduces oil consumption and operati ... more info

A premium Prestone antifreeze/coolant change begins with Prestone Super Radiator Flush. Helps remove rust deposits and oily residue in an easy, one-step process. Premium formulation helps maximize cooling system efficiency. Super Radiator Flush maximizes ... more info





Catalytic Converter Cleaner helps eliminate rotten egg odor. A clogged or restricted Catalytic Converter can decrease fuel efficiency, rob horsepower, cause engine overheating and premature engine wear. Catalytic Converter Cleaner extends time between tun ... more info




Bar's Leaks Heavy Duty Cooling System Sealer permanently seals leaks in plastic, aluminum, and metal radiators, heater cores, blocks, heads, gaskets, and freeze plugs. Prevents rust, cuts electrolysis, and lubes water pump. Compatible with all brands of a ... more info

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