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10 bestEngine Leak Sealerof November 2025

112M consumers helped this year.

1

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant
K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal

9.8

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2

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant
K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

K-Seal

9.6

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3

Bar's Products OS-1-4PK Oil Seal (Engine Oil Burning/Leak Repair)
Bar's Products OS-1-4PK Oil Seal (Engine Oil Burning/Leak Repair)

Bar's Leaks

9.4

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10% off

4

Wynn's Engine Oil Stop Leak Sealer Treatment Additive For All Engine Types 325ml
Wynn's Engine Oil Stop Leak Sealer Treatment Additive For All Engine Types 325ml

Wynn's

9.1

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5

MANNOL Energy 5W30 C3 Fully Synthetic Engine Oil, 5 Litres
MANNOL Energy 5W30 C3 Fully Synthetic Engine Oil, 5 Litres

MANNOL

8.9

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Related productsUp to 10% off

Visbella Neutral RTV 100% Gasket Maker Oil and Water Resistance Anti-Freeze Remain Flexible Ultra 3 oz. High Temperature 600°F Sealant Tube

Visbella Neutral RTV 100% Gasket Maker Oil and Water Resistance Anti-Freeze Remain Flexible Ultra 3 oz. High Temperature 600°F Sealant Tube

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Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

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Lucas Oil 40278 Engine Stop Leak - 946ml

Lucas Oil 40278 Engine Stop Leak - 946ml

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LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

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6

LIQUI MOLY Pro-Line Oil Loss Stop | 1 L | Oil additive | SKU: 5182
LIQUI MOLY Pro-Line Oil Loss Stop | 1 L | Oil additive | SKU: 5182

Liqui Moly

8.6

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7

AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging
AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging

AMK

8.4

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8

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads
Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

ARZER

8.1

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9

Wynn's Formula Gold Engine Oil Treatment Increase Compression And Reduces Wear Petrol & Diesel
Wynn's Formula Gold Engine Oil Treatment Increase Compression And Reduces Wear Petrol & Diesel

Wynn's

7.9

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10

AT-205 Seal Leak Stopper 8 Ounce - 2 Pack
AT-205 Seal Leak Stopper 8 Ounce - 2 Pack

ATP Automotive

7.6

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