10 Best Oil Stop Leak Additive of August 2025

• 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

• 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

• 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
• DOSAGE: One bottle treats 4 to 6 quarts of oil.

Bar's Leaks

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

Bar's Leaks

• Very cost effective
• AFFORDABLE SOLUTIONS
• Improves steering response
• Stops rack and pinion problems

Lucas Oil

• Removes varnish and restores pressure for more efficient operation
• Specially suited for use in equipment with wet brakes
• Conditions old seals and O-rings to stop and prevent future leaks
• Extends life of hydraulic fluid up to 2 times

Lucas Oil

• 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

• Rejuvenates seals and gaskets
• Helps stop leaks, noise and smoking
• Contains zinc anti-wear agent ZDDP
• Excellent for all cars, light trucks and SUV's
• Use every oil change

STP

• Renews worn seals with no risk of damage or eventual corrosion
• Compatible with petroleum, semi-synthetic and full synthetic motor oils
• Package Dimensions: 36.322 L x 31.75 H x 26.924 W (centimeters)
• Included components: Lucas Engine Oil Stop Leak 32oz (12 Unit Case)

Lucas Oil