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Radiator Stop Leak Comparison - June 2025
| 1 Best Choice  9.9Exceptional | 2  9.8Exceptional | 3  9.7Exceptional | 4 Best Value  9.6Exceptional | 5  9.5Excellent | 6  9.3Excellent | 7  9.2Excellent |
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ModelK-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required | Model K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent 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 ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g | Model Bar's Leaks 1109 Liquid Copper Block Seal, Intake and Radiator Stop Leak, 18 oz. | One Step, Safe for All Cooling Systems | Model Bar's Leaks 1177 Radiator Stop Leak Tablets, 1.76oz | Model Bar's Leaks Radiator Stop Leak, 11 oz |
BrandK-Seal | Brand K-Seal | Brand Liqui Moly | Brand ACDelco | Brand Bar's Leaks | Brand Bar's Leaks | Brand Bar's Leaks |
Reviews | Reviews | Reviews | Reviews | Reviews  | Reviews | Reviews - |
Features | ||||||
Worth the money 9.1 | Worth the money 8.9 | Worth the money 8.6 | Worth the money 9.9 | Worth the money 9.1 | Worth the money 8.6 | Worth the money 8.4 |
Simple to use 9.6 | Simple to use 9.6 | Simple to use 9.9 | Simple to use 9.9 | Simple to use 9.3 | Simple to use 8.6 | Simple to use 8.6 |
Distance 8.6 | Distance 8.1 | Distance 9.3 | Distance 9.9 | Distance 8.1 | Distance 7.4 | Distance 7.2 |
Tech Specs | ||||||
item weight 9.6 ounces | item weight 1.19 pounds | item weight 11.2 ounces | item weight 1.12 ounces | item weight 1.12 pounds | item weight 1.76 ounces | item weight 12.8 ounces |
manufacturer part number ST5501 | manufacturer part number ST5516 | manufacturer part number 20132 | manufacturer part number 10-108 | manufacturer part number 1109 | manufacturer part number 1177 | manufacturer part number 1199 |
customer reviews4.3 4.3 out of 5 stars 10, 635 ratings 4.3 out of 5 stars | customer reviews 4.3 4.3 out of 5 stars 1, 288 ratings 4.3 out of 5 stars | customer reviews 4.4 4.4 out of 5 stars 337 ratings 4.4 out of 5 stars | customer reviews 4.5 4.5 out of 5 stars 791 ratings 4.5 out of 5 stars | customer reviews 4.3 4.3 out of 5 stars 1, 033 ratings 4.3 out of 5 stars | customer reviews 5.0 5.0 out of 5 stars 2 ratings 5.0 out of 5 stars | customer reviews - |
model K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair | model ST5516HD | model Radiator Stop Leak | model AC Delco | model - | model Bar's Leaks Radiator Stop Leak Tablets | model Bar's Leaks Radiator Stop Leak |
product dimensions 7.87 x 2 x 6 inches | product dimensions 5.9 x 4.1 x 1.9 inches | product dimensions - | product dimensions - | product dimensions 7.5 x 2.6 x 2.6 inches | product dimensions - | product dimensions - |
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
9.9
1K-SealK-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
9.6 Simple to use9.1 worth the money8.6 distanceWhy we love it
No need to drain or flush.
Works with all antifreeze types.
Quick and easy application.
-
9.8
2K-Seal
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent 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
At BestChoice.com, our team curates a selection of top products from a vast array available online, using a sophisticated ranking system based on carefully defined criteria.While traditional hands-on testing has its merits, our use of AI technology offers distinct advantages. AI allows us to process and analyze vast amounts of data from multiple sources, providing a comprehensive view that goes beyond what manual testing can achieve. This approach enables us to deliver insights that are aligned with current trends and consumer preferences, ensuring our reviews are both relevant and up-to-date.
Features
Our AI-driven analysis examines key attributes, capabilities, and other critical factors tailored to each product category. This method allows us to assess effectiveness from various perspectives, ensuring a well-rounded evaluation.
Consumer Reviews
We aggregate and evaluate consumer feedback from across the internet, giving weight to ratings and reviews that reflect the most reliable insights. AI enhances this process by filtering and prioritizing data, offering a balanced view without the need for direct personal endorsements.
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.
