10 bestEngine Leak Sealerof October 2025
112M consumers helped this year.
10% off
1

Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart
Lucas Oil

10.0
8% off
2

Bar's Leaks OS-1 Seal (Engine Oil Burning/Leak Repair), 16.9 Fluidounces
Bar's Leaks

10.0
3

STP High Mileage Oil Treatment + Stop Leak Engine Oil Additive, 15 fl oz, Contains ZDDP Anti-Wear Agent to Fight Friction, Rejuvenates Seals and Gaskets, Stops Leaks
STP

10.0
4

Bar's Leaks 1040 Grey Rear Main Seal Repair Concentrate - 16.9 oz.
Bar's Leaks

10.0
5

Bar's Leaks Block Seal Head Gasket Sealant (Pack of 4),1100-4PK
Bar's Leaks

9.8
6

Blue Devil (49499) Engine Oil Stop Leak - 8 Ounce
BlueDevil Products

9.6
7

Engine Oil Stop Leak Top Off Additive/6x1/Quart
Lucas Oil

9.3
8

Bar's Leaks 1010 Grey Engine Oil Stop Leak - 11 oz.
Bar's Leaks

9.0
9

XADO ATOMEX Stop Leak Engine Oil Additive Sealer (Bottle, 250 ml) - Repair Gaskets & Seals Treatment
XADO

8.8
40% off
10

Bar's Leaks 1000 Engine Repair - 16 oz.
Bar's Leaks

8.5

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