10 Best Engine Oil Stop Leak Additive of December 2025

• 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
• Use 1/2 bottle for smaller systems (3. 5 - 4. 4 quarts of oil), in larger systems use 1 bottle for every 6 quarts, in small engines use approximately 3oz to every quart of oil

Bar's Leaks

• Stops AND prevents engine oil leaks caused by dried, shrunken, or harden seals
• Recommended for rear main seal repair
• Stops smoke and repairs rear main seals
• Safe & compatible with ALL engine oils

NO LEAK

• Restores Elasticity And Stretch Ability Of Rubber Gaskets And Seals
• Stops Oil Leakages From The Engine And Prevents Their Emerging In The Future
• Eliminates The Need For Expensive Repair
• Reduces Engine Noise and Oil Consumption
• Compatible With Motor Oils Of All Types

XADO

• 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

Liqui Moly

• Stops and seals motor oil leaks
• Works with all types of motor oil
• Restores gaskets; seals to stop and prevent engine oil leaks

Bar's Leaks

• Permanently seal seeping or dripping oil leaks
• Made in United States
• Package Dimensions : 3.25 L x 6.0 H x 1.0 W (inches)
• Package Weight : 1.0 pounds

BlueDevil Products

• Increases oil pressure
• Reduces friction
• Helps clean internal parts
• Quiets noise
• Reduces oil consumption

Bar's Leaks

• 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

Lucas Oil

• Professional strength fast acting resealer, stops leaks fast
• Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems
• Compatible with conventional and synthetic oils, ATF, gear oil, power steering fluids and hydraulic oil
• Does not contain petroleum distillates, will not over-swell or breakdown seals
• 8oz bottle will treat a 6 quart capacity, adjust accordingly

ATP Automotive

• Safe and easy to use, and works quickly
• Best stop leak formula money can Buy
• Synthetic blend, for all engines
• Repair leaking front and rear main seals
• Stop cam and timing seal leaks

Bar's Leaks