Best Oil Additive To Stop Leaks

Peter | 25-12-2025

You will find our hand-picked selection of Best Oil Additive To Stop Leaks below. You have a wide variety of choices of brands such as Bar’s Leaks,Lucas Oil,STP,XADO available to you as a result of the fact that each one of them has a unique pricing, look, and feel. Continue reading for an in-depth analysis in our Best Oil Additive To Stop Leaks buying guide!

Our experts tested a variety of Best Oil Additive To Stop Leaks on the market. Right at the top of the list is Bar’s Leaks Best Oil Additive To Stop Leaks. Check out some more of our favorites below, and read some valuable insight from our experienced editors.

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
Bar's Leaks Rear Main Seal Repair, 16.9 oz
Bar's Leaks Rear Main Seal Repair, 16.9 oz

Top 10 Best Oil Additive To Stop Leaks

We researched and compared the top products in the Best Oil Additive To Stop 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. Bar's Leaks Rear Main Seal Repair, 16.9 oz

Bar's Leaks Rear Main Seal Repair, 16.9 oz
9.5

Bar's Leaks

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  • Seals timing cover, cam seal, rear main and other hard to stop oil leaks
  • Add to engine oil
  • Specifically designed to seal rear main leaks, but also works better than a conventional stop leak on all other leaks
  • Add entire bottle of Rear Main Seal Repair to engine crankcase (where you add oil) at or between oil changes. Do not overfill. Most leaks will stop within 100 miles or 2 days of driving

4. 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

5. STP High Mileage Oil Treatment + Stop Leak - 15 FL OZ

  • Protect the engine in your high-mileage vehicle with STP High Mileage Oil Treatment + Stop Leak. Formulated especially for vehicles with over 75,000 miles, this high-viscosity engine additive includes ZDDP oil additive as an anti-wear agent for protection. This STP oil treatment creates a thick cushion between moving engine parts to help fight metal-to-metal friction. Engine stop leak helps to rejuvenate seals and gaskets and stop engine leaks, noise and smoking to improve performance. Add to engine oil with each oil change during car maintenance. It's suitable for cars, light trucks and SUVs.
  • One 15 fl oz bottle of STP High Mileage Oil Treatment + Stop Leak
  • ZDDP oil additive prevents wear to protect your high-mileage vehicle
  • High-viscosity formula creates a thick cushion between moving engine parts to reduce friction
  • Leak stopper helps prevent engine leaks, noises and smoking and helps to rejuvenate seals and gaskets
  • Add this oil treatment to engine oil during every oil change

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. Bar's Leaks Axle and Differential Gear Repair, 16.9 Oz

Bar's Leaks Axle and Differential Gear Repair, 16.9 Oz
8.3

Bar's Leaks

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  • STOPS PINION, AXLE, OUTPUT SHAFT AND OTHER SEAL LEAKS: This is a treatment additive for use with automotive, heavy duty, agricultural, marine and industrial gear oils.
  • ANTI-WEAR AW AGENTS: Superior anti-wear, anti-foam and anti-corrosion protection.
  • SEAL CONDITIONER: Extends system life by stopping leaks, reducing noise and improving gear performance.
  • PERFORMANCE ADDITIVE BOOSTER: Designed to mix with all synthetic and conventional petroleum GL-4, GL-5, MT-1 gear oil / lube grades including 75W-90, 80W-90, 75W-140, 85W-140 and all others.
  • Manufactured in the USA, this product works in all manual gearboxes, differentials, open & posi axles and more. Stops pinion, axle, output shaft and other seal leaks. Reduces grinding, whining, clunking and protects gears.

8. 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

9. 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

10. BlueDevil Products 49499 Oil Stop Leak - 8 Ounce

BlueDevil Products 49499 Oil Stop Leak - 8 Ounce
8.5

Bluedevil Products

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  • Easy to use: The BlueDevil Oil Stop Leak is designed to be easy to use, simply pour the recommended amount into the leaking components oil slump, or crank case.
  • Permanent seal: BlueDevil offers a permanent solution with our Engine Oil Stop Leak that is proven to seal your leak and get you back on the road again. Formulated to stop your seeping or dripping oil leaks permanently and keep your leak sealed even after miles of driving.
  • Compatible with all types of engines: Compatible with gasoline and diesel engines, making it a versatile product that can be used on a wide range of vehicles.
  • Versatile Uses: Repairs and reconditions rubber seals throughout any fluid oil system. Can be used for pinion seals, gear cases, refillable shock absorbers, gear boxes, axle seals, and gear differentials.
  • Safe to use: Designed with a non-clogging formula that wont temporarily swell seals. Does not contain petroleum and is not harmful to your engine

Peter

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