Best Additive To Stop Engine Oil Leaks

Peter | 04-01-2026

If you aren’t someone who makes frequent purchases, selecting the best Best Additive To Stop Engine Oil Leaks won’t be an easy chore for you. However, you shouldn’t be concerned because we have provided you with the most comprehensive list possible of the top Best Additive To Stop Engine Oil Leaks. Have a look at the products on our list, and pick the ones that appeal to you the most.

We researched and tested Best Additive To Stop Engine Oil Leaks in the market to get you this list. Our most recommended product is Bar’s Leaks Best Additive To Stop Engine Oil Leaks. Check out our picks for all of our favorites, and be sure to read our buying guide to get all the information you need to make the best choice!

Editor's Choice
Bar's Leaks OS-1 Oil Seal Engine Oil Burning and Leak Repair, 16.9 oz.
Bar's Leaks OS-1 Oil Seal Engine Oil Burning and Leak Repair, 16.9 oz.
Premium Pick
Bar's Leaks 1000 High Mileage Engine Repair, 16.9 oz | Restores Performance, Increases Compression &
Bar's Leaks 1000 High Mileage Engine Repair, 16.9 oz | Restores Performance, Increases Compression &
Budget Pick
Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart
Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart

Top 10 Best Additive To Stop Engine Oil Leaks

We researched and compared the top products in the Best Additive To Stop Engine Oil Leaks category to provide you with these recommendations.

1. Bar's Leaks OS-1 Oil Seal Engine Oil Burning and Leak Repair, 16.9 oz.

Bar's Leaks OS-1 Oil Seal Engine Oil Burning and Leak Repair, 16.9 oz.
9.8

Bar's Leaks

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  • REPAIRS LEAKING MAIN SEALS AND GASKETS: We have designed this product to work in all gasoline and diesel engines including turbocharged, EcoBoost, hybrid and even racing engines.
  • RENEWS WORN VALVE SEALS AND GUIDES: Your vehicle is a good candidate for Bars Leaks Oil Seal Engine Oil Burning & Leak Repair if it does not consume more than one quart of oil per day.
  • STOPS OIL BURNING & BLUE EXHAUST SMOKE: This covers 3, 4, 5, 6, 8 and 10 cylinder engines in all cars, trucks, vans and SUVs. Our product can also be used in heavy-duty applications referencing the appropriate dosage level.
  • SEAL ALL OTHER OIL LEAKS, DRIPS AND CONSUMPTION: This applies to a wide range of other motor applications too - tractors, boats, RVs, motorcycles (including wet clutch), ATVs, lawn equipment.
  • MADE IN THE USA

2. Bar's Leaks 1000 High Mileage Engine Repair, 16.9 oz | Restores Performance, Increases Compression &

Bar's Leaks 1000 High Mileage Engine Repair, 16.9 oz | Restores Performance, Increases Compression &
9.5

Bar's Leaks

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  • RESTORES PERFORMANCE: Contains a combination of the best performance additives to repair the most common oil-related problems
  • INCREASES COMPRESSION AND HORSEPOWER: Restores lost compression and power, reduces noise and oil consumption, while improving the performance of worn cylinders, rings, bearings, and seals
  • STOPS LEAKS, NOISE, AND SMOKING: For most vehicles, this is your last chance before paying an expensive repair bill or replacing the vehicle
  • FRICTION MODIFIERS: Engine Repair can be used to top off the existing oil when low, or add a bottle when changing the oil and filter
  • REPAIR-IT: Engine Repair-It can be used to top off existing oil when low or add a bottle when changing oil.

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

Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart
8.9

Lucas Oil

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  • Product Type: Auto Oil
  • Package Dimensions: 8.89 L X 10.16 W X 30.48 H (Centimeters)
  • Package Weight: 0.953 Kilograms
  • Country Of Origin: United States

4. Lucas Oil 11100 Engine Oil Stop Leak - Top Off Additive - 1 Quart

Lucas Oil 11100 Engine Oil Stop Leak - Top Off Additive - 1 Quart
8.7

Lucas Oil

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  • Long lasting
  • Conditions seals and o-rings to stop oil leaks
  • Contains state-of-the-art components to reduce friction and wear and extend engine life
  • Effective seal swell agents are used to condition hard and shrunken seals and gaskets
  • 1 quart treats up to 6 quart capacity

5. LIQUI MOLY Motor Oil Saver | 300 ml | Oil additive | SKU: 2020

LIQUI MOLY Motor Oil Saver | 300 ml | Oil additive | SKU: 2020
8

Liqui Moly

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  • Reduces oil consumption via the piston rings and valve guides
  • Prevents blue, smoky exhaust fumes
  • Prevents leaks due to leaks at elastomeric seals
  • Regenerates engine seals made of plastic and rubber
  • Prevents pollution of the environment due to oil dripping from the engine

6. XADO ATOMEX Oil Additive Stop Leak Engine - Restore Seal and Gaskets, Treatment for Car Engine High

  • Elasticity Restorer: Look no further for a solution to restore elasticity ability of rubber gaskets and seals. Say goodbye to leaks and fugas with our formula for complete rejuvenation and protection.
  • Leak Prevention: Ideal for stopping engine oil leakages. Engineered for all engines, including auto and motorcycle, our slick liquid formula fixes leaks and rejuvenates seals.
  • Cost Saver: It offers complete protection for older and new engines. This multi-purpose aditivo is perfect for stopping leaks, enhancing engine performance, and extending the life of your vehicle.
  • Efficiency Enhancer: Reduces engine noise and oil consumption with our advanced formula.The slick liquid fix rejuvenates seals, valves, and cylinders, ensuring smoother operation and reducing wear.
  • Universal Compatibility: This multi-purpose sealant works with auto, motorcycle, and marine engines, preventing fugas and leaks while rejuvenating seals, valves, and cylinders.

7. Prestone Stop Leak Additive Engine Oil 12 oz bottle

  • Rapidly halts leaks by rejuvenating seals that have become hardened or shrunken. Provides extended engine protection, lasting twice as long as traditional oil-based stop leak solutions. Compatible with all types of motor oils, including synthetic, conventional, and high mileage variants.
  • Container type: Bottle
  • Liquid volume: 12.0 fluid_ounces

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

Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart
9.1

Lucas Oil

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  • Compatible with petroleum, semi-synthetic, and full synthetic motor oils
  • Renews worn seals with no risk of damage or eventual corrosion
  • Reduces engine noise and oil consumption, while raising oil pressure
  • Contains no harmful solvents

9. Bar's Leaks High Mileage Engine Repair-It, Pack of 4

Bar's Leaks High Mileage Engine Repair-It, Pack of 4
8.3

Bar's Leaks

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  • RESTORES PERFORMANCE: Contains a combination of the best performance additives to repair the most common oil-related problems
  • INCREASES COMPRESSION AND HORSEPOWER: Restores lost compression and power, reduces noise and oil consumption, while improving the performance of worn cylinders, rings, bearings, and seals
  • STOPS LEAKS, NOISE, AND SMOKING: For most vehicles, this is your last chance before paying an expensive repair bill or replacing the vehicle
  • FRICTION MODIFIERS: Engine Repair can be used to top off the existing oil when low, or add a bottle when changing the oil and filter
  • REPAIR-IT: Engine Repair-It can be used to top off existing oil when low or add a bottle when changing oil.

10. Bardahl 2117 NoSmoke + StopLeak Motor Oil Additive - Treatment for Oil Burning & Excessive Exhaust

Bardahl 2117 NoSmoke + StopLeak Motor Oil Additive - Treatment for Oil Burning & Excessive Exhaust
7.7

Bardahl

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  • NO MORE BURNING OIL: Stop your engine from oil burning with the enhanced NoSmoke + StopLeak motor oil additive! Bardahl NoSmoke oil additive gives you top-quality protection and restoration for old engines by "filling in" loose tolerances with an extra-thick formula that reduces oil burning and excessive exhaust smoke. This engine additive stop oil burning solution ensures your vehicle runs cleaner and smoother.
  • LEAK SEALER: NoSmoke + StopLeak doesn't just reduce burn; it helps seal empty spaces that develop in engines over the years, acting as an engine oil leak sealer to reduce engine noise and quiet noisy lifters. It even helps restore the reliability of dry, brittle seals to stem further oil leaks. Your car won't just run better; it'll sound better too. Stop the smoke and the noise with this effective stop leak oil additive!
  • CONTROL EMISSIONS: As engines loosen, smoke and pollutants released in exhaust can increase over time, so a car that would have once passed emission standards might slip below acceptable levels. NoSmoke oil additive with StopLeak can not only help reduce or eliminate smoke, but it can also cut down on pollutants released in exhaust to help meet emissions standards. This no smoke oil additive is perfect for maintaining cleaner emissions and protecting your engine.
  • MAINTAIN AND IMPROVE: Bardahl's NoSmoke + StopLeak is the best motor oil additive for older cars. Not only will it help reduce wear and improve the function of your engine, but it can also restore lost performance and help improve compression over time. Use the best engine oil additive to maintain your car's longevity when you use NoSmoke! This oil additive for car engine treatment is a must-have for any aging vehicle.
  • A NAME YOU CAN TRUST: For over 85 years, Bardahl has been based in America, making the best oil additive motor products for car engines. We're a family-owned and operated company, and we pride ourselves on producing the finest products on the marketplace while developing industry-leading innovations in engine additive solutions.

Peter

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