Advertising Disclosure Radiator Flush Comparison - August 2025
7 Best Radiator Flush In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
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| 1 Best Choice  9.6Exceptional | 2  9.5Excellent | 3  9.3Excellent | 4 Best Value  9.0Excellent | 5  8.9Very Good | 6  8.7Very Good | 7  8.5Good |
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ModelLIQUI MOLY 5189 Pro-Line Radiator Cleaner 1 Litre - Black | Model Prestone Coolant Flush, Engine Coolant Flush For Car To Prevent Problems & Maximise Performance, Car Coolant Flush With Advanced Cleaner To Dissolve Corrosion & Scale, Safe For All Engines, 1 Litre | Model Holts Speedflush Coolant Flush, Universal Car Radiator Flush, High Performance Coolant Flush For Radiators & Cooling System, Quick & Easy To Use, Prevents Overheating, Suitable For All Cars, 250ml | Model LIQUI MOLY Radiator Cleaner | 300 ml | Cooler additive | SKU: 1804 | Model Everbuild P11 Central Heating System Cleanser, 1 Litre | Model Wynn's Radiator Flush Cleaner For All Car Antifreeze & Coolant Systems 325ml | Model Holts Speedflush Coolant Flush, Universal Car Radiator Flush, High Performance Coolant Flush For Radiators & Cooling System, Quick & Easy To Use, Prevents Overheating, Suitable For All Cars, 250ml |
BrandLiqui Moly | Brand Prestone | Brand Holts | Brand Liqui Moly | Brand Everbuild | Brand Wynn's | Brand Holts |
Reviews | Reviews  | Reviews | Reviews | Reviews  | Reviews | Reviews - |
Tech Specs | ||||||
product dimensions8.1 x 8.1 x 24.3 cm 1.01 kg | product dimensions 6.1 x 10.9 x 23.2 cm 1.12 kg | product dimensions 4.2 x 7.8 x 14.6 cm 350 g | product dimensions 12 x 6 x 6 cm 300 g | product dimensions 19 x 14 x 6 cm 517.1 g | product dimensions 2.36 x 3.94 x 9.37 cm 330 g | product dimensions 4.2 x 7.8 x 14.6 cm 700 g |
item weight- | item weight 1.12 kg | item weight 350 g | item weight - | item weight 517 g | item weight 330 g | item weight 700 g |
manufacturer part number- | manufacturer part number PREP0002A | manufacturer part number RK1R | manufacturer part number - | manufacturer part number - | manufacturer part number WY56064 | manufacturer part number RK1R |
customer reviews- | customer reviews 4.5 4.5 out of 5 stars 287 ratings 4.5 out of 5 stars | customer reviews 4.5 4.5 out of 5 stars 1, 026 ratings 4.5 out of 5 stars | customer reviews - | customer reviews 4.5 4.5 out of 5 stars 220 ratings 4.5 out of 5 stars | customer reviews 4.6 4.6 out of 5 stars 258 ratings 4.6 out of 5 stars | customer reviews - |
model- | model PREP0002A | model LOYRK1R | model - | model - | model WY56064 | model - |
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
9.6
1Liqui MolyLIQUI MOLY 5189 Pro-Line Radiator Cleaner 1 Litre - Black
Why we love it
Compatible with all systems.
Effective for large volumes.
Enhances heat exchange.
Main highlights- Suitable for all cooling water systems in motor vehicles, buses and commercial vehicles.
- Suitable for all cooling and heating systems.
- For professionals only!
- Deposits in the cooling/heating system form barriers against heat exchange, blocking the thermostat and regulating mechanisms.
- Compatible with all standard cooling stabilisers and anti-freeze.
- Add contents to the cooling water. Run the heating system. Depending on the degree of contamination let the engine run approximately 10 to 30 minutes. Drain the cleaner and flush out the cooling system with water.
- 1 litre is enough for up to 50 litres of coolant.
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9.5
2Prestone
Prestone Coolant Flush, Engine Coolant Flush For Car To Prevent Problems & Maximise Performance, Car Coolant Flush With Advanced Cleaner To Dissolve Corrosion & Scale, Safe For All Engines, 1 Litre
Main highlights- UNIVERSAL ENGINE COOLANT: This Cooling System Flush is safe for all engines and all cooling system components including: All antifreeze and car coolant fluid, as well as all engine metals, gaskets, plastics and hoses.
- OVER 90 YEARS OF EXCELLENCE: At Prestone, we have spent nearly a century offering solutions to your car troubles to make your life stress free. If you want the perfect solution to protect your vehicle and maximise performance, we have what you need.
- HIGH PERFORMANCE COOLANT FLUSH: Prestone Engine Coolant Flush is a simple solution that can be used at home to get rid of deposits and build up in the cooling system, helping to prevent problems and extend the life of your engine.
- CONTAINS ADVANCED CLEANER: Our car Coolant Flush has been developed by the experts at Prestone to keep your engine at peak performance. It contains an advanced cleaner that eliminates scale, corrosion, silicate deposits and oil & fuel contamination. Perfect for cleaning up after a blown head gasket, or to restore cabin heat in vehicles that use Silicate based Antifreeze like VW G12++ and G13 Coolant
- 10 YEAR PROTECTION: Enjoy an industry-leading 10 year guarantee with our Coolant Flush. Flush and refill with Prestone Antifreeze Coolant for a longer engine life. This 1 Litre bottle is enough to flush the whole system with just one application.
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9.3
3Holts
Holts Speedflush Coolant Flush, Universal Car Radiator Flush, High Performance Coolant Flush For Radiators & Cooling System, Quick & Easy To Use, Prevents Overheating, Suitable For All Cars, 250ml
Main highlights- UNIVERSAL CAR RADIATOR FLUSH: Holts Speedflush can be used on any engine to clear out scale & debris, ready for filling with antifreeze/coolant. The special formulation allows it to clear water channels and is safe for use with metal & rubber hoses.
- PROFESSIONAL COOLANT FLUSH : Speedflush is the total coolant flush, specially designed to clear your radiator and cooling system quickly. It will flush out harmful scale and deposits to prevent overheating and extend the life of your vehicle.
- OVER 100 YEARS OF EXCELLENCE: At Holts, we have spent over a century offering solutions to your car troubles to make your life easier and stress free. If you want the perfect tools to maintain, repair or clean your vehicle, we have what you need.
- EASY TO USE COOLANT FLUSH: Add the product to the cooling system & run the engine for a few minutes. The product will then circulate through the system & remove any deposits. Wait for the engine to cool, then drain the old coolant & replace it.
- AVOID COSTLY REPAIRS: With the rising cost of car replacement parts, save yourself the money and hassle of taking your car to the garage with Speedflush Radiator Flush. We have used our technical know-how to save you time and money.
Our ranking system
The TopChoice.co.uk Team selects top-of-the-line items from a wide selection and conducts rigorous evaluations on almost all the products available on the internet. We rank each product based on how well it matches our criteria.We can ensure that the product is well-tested with the help of our expertise, experts, and artificial intelligence technology. TopChoice.co.uk requires consistent care for the products we review, ensuring that our assessments are always accurate and up to date.
Features
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Consumer Reviews
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Popularity
Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.
Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
