Rank Product Name Score
1 K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal		 9.8 GET ON AMAZON
2 Genuine GM (12378255) Fluid 3634621 Cooling System Seal Tablet - 4 Grams, (Pack of 5) Genuine GM (12378255) Fluid 3634621 Cooling System Seal Tablet – 4 Grams, (Pack of 5)
GM		 9.5 GET ON AMAZON
3 Bar Bar’s Leaks HDC Radiator Stop Leak Tablet – 60 Grams
Bar’s Leaks		 9.3 GET ON AMAZON
4 Bar Bar’s Leaks 1194 Grey Radiator Stop Leak – 6 oz.
Bar’s Leaks		 8.9 GET ON AMAZON
5 Bar Bar’s Leaks 1196 Grey Radiator Stop Leak – 11 oz.
Bar’s Leaks		 8.6 GET ON AMAZON
6 Genuine GM Fluid 12378255 Cooling System Seal Tablet - 4 Grams, (Pack of 5) Genuine GM Fluid 12378255 Cooling System Seal Tablet – 4 Grams, (Pack of 5)
GM		 8.6 GET ON AMAZON
7 Prestone AS661 Engine Block Stop Leak with Kevlar, 16.5 fl. oz. Prestone AS661 Engine Block Stop Leak with Kevlar, 16.5 fl. oz.
Prestone		 8.6 GET ON AMAZON
8 Liqui Moly 20132 Radiator Stop Leak 8.45 Fluid_Ounces Liqui Moly 20132 Radiator Stop Leak 8.45 Fluid_Ounces
Liqui Moly		 8.3 GET ON AMAZON
9 Bar Bar’s Leaks J-100 DiFM Cooling System Treatment – 5 Grams
Bar’s Leaks		 8.2 GET ON AMAZON
10 Interdynamics Certified A/C Pro Engine Cooling Systems UV Dye (1 Ounce) Interdynamics Certified A/C Pro Engine Cooling Systems UV Dye (1 Ounce)
Interdynamics		 8.0 GET ON AMAZON

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