Lucas Oil Engine Oil Stop Leak is a unique formulation of Lucas additives and proprietary base stocks engineered to stop seal leaks from the inside — without the use of harsh solvents or caustic chemicals. Trusted by professional mechanics and everyday drivers across automotive, marine, agricultural, and industrial applications, this product line delivers a proven, cost-effective alternative to costly mechanical repairs on worn and high-mileage engines.
The formula works by conditioning, swelling, and softening dried or shrunken rubber seals, gaskets, and O-rings, encouraging them to return toward their original dimensions and seal more effectively. As an added benefit, Lucas additives fill microscopic gaps between worn internal components, helping to restore compression, reduce blow-by, and quiet noisy valve trains. The result is measurably reduced oil consumption, improved oil pressure, and smoother overall engine performance.
Key Features:
- Conditions and revitalizes rubber seals, gaskets, and O-rings to stop leaks at the source
- Reduces engine noise and oil consumption in high-mileage and worn engines
- Helps restore and maintain proper oil pressure
- Can extend engine oil life by 50% or more when used as directed
- Compatible with petroleum, semi-synthetic, and full synthetic motor oils
- Effective in automatic transmissions, hydrostatic transmissions, and hydraulic systems
- Helps eliminate white exhaust smoke caused by worn valve seals
- Contains no harmful solvents — safe for seals, gaskets, and internal engine components
- Will not degrade the performance or additive package of modern engine oils
How It Works:
Lucas Oil's proprietary additive technology penetrates and conditions aging rubber seals and gaskets, restoring them toward their original dimensions for a more effective seal. In engines with accumulated wear, the advanced formula fills microscopic gaps between moving parts, helping to restore compression and reduce blow-by. The product works gradually over several days of normal operation to deliver full effectiveness, making it an excellent choice for both corrective treatment and ongoing preventive maintenance.
Application Guidelines:
For engine use, add approximately 20% of the total system capacity to existing motor oil. For transmission and hydraulic system applications, a 10% concentration is generally sufficient, though higher concentrations may be used in severely worn units. For best results in high-mileage engines exhibiting valve seal wear, incorporate with every oil change to maintain peak performance and minimize leakage.
Lucas Oil Engine Oil Stop Leak is a proven, cost-effective solution for extending engine life and eliminating oil leaks — without the need for major mechanical repairs.
