DEI Radiator Relief Thermal Additives

Give Your Engine A Cooldown

DEI's highly-acclaimed Radiator Relief line of additives has expanded with several thermal products designed to increase the cooling efficiency of any stock or aftermarket radiator. Reduce engine temperature up to 30 Degrees F with new anti-foam formulas using corrosion inhibitors. Today's gasoline and diesel-powered motors aren't as efficient as we'd like them to be, but DEI's Radiator Relief products can increase the cooling system efficiency of any vehicle.

Design Engineering Inc. Radiator Relief Thermal Additives

Give Your Engine A Cooldown

Single Bottles

DEI Radiator Relief 16 oz

DEI Radiator Relief 16 oz

DEI Radiator Relief Flush 16 oz

DEI Radiator Relief Flush 16 oz

DEI Radiator Relief for Diesels 16 oz

DEI Radiator Relief for Diesels 16 oz

DEI Heater Hotter 16 oz

DEI Heater Hotter 16 oz

DEI Chill Charger 16 oz

DEI Chill Charger 16 oz

12-Pack Bottles

DEI DEI Radiator Relief Thermal Additives

DEI DEI Radiator Relief Thermal Additives

Cooling System Summer Heat Kits

DEI Cooling System Summer Heat Kit Includes: (1) 16oz Bottle DEI Radiator Relief

DEI Cooling System Summer Heat Kit Includes: (1) 16oz Bottle DEI Radiator Relief

Cooling System Flush and Cool Kits

DEI Cooling System Flush and Cool Kit Includes: (1) 16oz Bottle DEI Radiator Relief

DEI Cooling System Flush and Cool Kit Includes: (1) 16oz Bottle DEI Radiator Relief

Single Bottles

DEI Coolant Additive Kit

DEI Coolant Additive Kit