Best Oil Leak Additive In 2025

In this article, we will explore the Best Oil Leak Additive that are now on the market. In addition to that, we have provided you with a detailed guide that will assist you in choosing the right product. We really hope that by looking through the reviews of the top Best Oil Leak Additive products that we’ve provided below, you’ll be able to quickly narrow your choices and select the one that best satisfies your needs.

We have spent lots of time testing. According to our research, we think Bar’s Leaks Best Oil Leak Additive is the best overall. For more of our top picks, read on! Also, check out our buying guide for some tips on how to choose the right Best Oil Leak Additive.

Editor's Choice

Bar's Leaks Oil Seal Engine Oil Burning and Leak Repair

9.8

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Premium Pick

Bar's Leaks High Mileage Engine Repair, 16.9 oz

9.5

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Budget Pick

Liqui Moly 2020 Motor Oil Saver - 300 ml

9.1

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Top 10 Best Oil Leak Additive

We researched and compared the top products in the Best Oil Leak Additive category to provide you with these recommendations.

1. Bar's Leaks High Mileage Engine Repair, 16.9 oz

9.5

Bar's Leaks

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Increases Oil Pressure
Reduces Friction
Helps Clean Internal Parts
Quiets Noise

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

8.3

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

3. Liqui Moly 2020 Motor Oil Saver - 300 ml

9.1

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

4. Bar's Leaks Oil Seal Engine Oil Burning and Leak Repair

9.8

Bar's Leaks

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This Premium Quality Synthetic Blend Works With All Types Of Motor/Engine Oil Including Regular Petroleum, High Mileage, Synthetic Blends And Fully Synthetic Formulas
Works In All Gasoline And Diesel Engines Including Turbocharged, Eco Boost, Hybrid And Even Racing Engines, Including 3, 4, 5, 6, 8 And 10 Cylinder Engines In All Cars, Trucks, Vans And Suv'S
Can Also Be Used In Heavy-Duty Applications As Well As Tractors, Boats, Rv'S, Motorcycles (Including Wet Clutch), Atv'S, Lawn Equipment
In Most Cases The Oil Leak Issue Will Be Repaired With A Single Dosage. However, For Best Results And To Prevent The Problems From Reoccurring, Use With Every Other Oil Change, Or Once Per Year

5. High Mileage Oil Treatment, Stop Leak Formula for Cars and Trucks, 15 Oz, STP

Stp

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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
Formulated for vehicles with more than 75,000 miles

6. Lucas Oil 10278 Engine Oil Stop Leak, 1 Quart

8.5

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

7. Lucas LUC10009 Transmission Fix 24 oz., Brown (Packaging May Vary) , White

8.3

Lucas

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Lucas Transmission Fix Stops Slip, Hesitation, Rough Shifting In Worn Transmissions And Completely Eliminates Most Seal Leaks
Fit Type: Universal
Can be added to existing fluid without draining any out
Improves shifting