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Radiator Stop Leak Comparison - June 2026
| 1 Best Choice  9.9Exceptional | 2 Best Value  9.7Exceptional | 3  9.6Exceptional | 4  9.4Excellent | 5  9.3Excellent | 6  9.2Excellent | 7  8.9Very Good |
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ModelBar's Leaks Liquid Aluminum Radiator and Heater Core Stop Leak. 6 Pack,1186-6PK | Model K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required | Model Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132 | Model Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz. | Model Bar's Leaks 1109 Liquid Copper Block Seal, Intake and Radiator Stop Leak, 18 oz. | One Step, Safe for All Cooling Systems | Model Prestone AS145 Stop Leak Repair for Radiators, Heater Cores, and Hoses, 11 oz., 1 pack | Model ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g (Pack of 5) |
BrandBar's Leaks | Brand K-Seal | Brand Liqui Moly | Brand Bar's Leaks | Brand Bar's Leaks | Brand Prestone | Brand ACDelco |
Reviews | Reviews | Reviews | Reviews  | Reviews | Reviews | Reviews  |
Features | ||||||
Worth the money 8.6 | Worth the money 8.9 | Worth the money 8.6 | Worth the money 9.1 | Worth the money 9.1 | Worth the money  9.3 | Worth the money 9.9 |
Simple to use 9.4 | Simple to use 9.6 | Simple to use 9.9 | Simple to use 9.1 | Simple to use 9.3 | Simple to use 9.6 | Simple to use 9.9 |
Distance 7.9 | Distance 8.1 | Distance 9.3 | Distance 9.1 | Distance 8.1 | Distance 9.4 | Distance 9.9 |
Tech Specs | ||||||
item weight- | item weight 1.19 pounds | item weight ‎11.2 ounces | item weight - | item weight 1.12 pounds | item weight 12.8 ounces | item weight 1.12 ounces |
manufacturer part number- | manufacturer part number ST5516 | manufacturer part number ‎20132 | manufacturer part number - | manufacturer part number 1109 | manufacturer part number AS145 | manufacturer part number 10-108 |
product dimensions- | product dimensions 5.9 x 4.1 x 1.9 inches | product dimensions - | product dimensions 3 x 3 x 6 inches 11 ounces | product dimensions 7.5 x 2.6 x 2.6 inches | product dimensions 1.91 x 3.04 x 5.64 inches | product dimensions - |
model- | model ST5516HD | model ‎Radiator Stop Leak | model - | model - | model AS145 | model AC Delco |
style- | style - | style ‎Modern | style - | style 1 Pack | style Pumps | style - |
Review- | Review - | Review - | Review - | Review | Review - | Review - |
Available On | Available On | Available On  | Available On | Available On | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.7
2K-Seal24% OffK-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
9.6 Simple to use8.9 worth the money8.1 distanceWhy we love it
Easy to use: just pour and go.
Compatible with all antifreeze types.
No need to drain or flush.
Our ranking system
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Features
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Consumer Reviews
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Popularity
Our system also considers the popularity of products, analyzing factors such as market presence, reputation, and user satisfaction. By leveraging AI, we capture a comprehensive picture of a product's standing in the market, which may not always be evident through traditional testing.
Value for money
AI allows us to compare products based on attributes like price, specifications, and user feedback, helping to determine their value for money. This data-driven approach offers an efficient and reliable way to assess how products stack up against one another in terms of cost-effectiveness.
