BlueDevil Products Oil Stop Leak 8 oz — non-clogging seal conditioner for gas & diesel

BlueDevil 49499 Oil Stop Leak is an 8-ounce engine oil additive formulated to seal and stop common oil leaks without clogging or damaging engine components.

Designed for both gasoline and diesel engines, this concentrated formula restores pliability to aged rubber seals and conditions metal-to-rubber contact surfaces to reduce seepage. The product arrives ready to use: pour the recommended dose into the crankcase or leaking oil reservoir and drive—BlueDevil backs the result with a satisfaction guarantee. It avoids petroleum-heavy solvents and is engineered to be safe for long-term use in a wide variety of vehicles and oil systems.

How does BlueDevil Oil Stop Leak work to stop oil leaks?

The formula lightly rejuvenates rubber seals and conditioners the seal interface so oil no longer finds a path to escape. It does not rely on swelling seals; instead it conditions and fills microscopic imperfections that cause weeping and dripping. Because the chemistry stays in suspension with engine oil, it circulates where needed and remains non-clogging.

• Conditions rubber and metal-to-rubber contact areas.
• Fills micro-gaps that cause seepage without swelling seals.
• Circulates with engine oil for targeted delivery.
• Formulated to avoid clogging filters or passages.

Will this product harm my engine or oil system?

BlueDevil is formulated to be safe for both gasoline and diesel engines when used as directed. The non-petroleum, non-clogging composition reduces risk of filter blockage and is intended to be compatible with standard engine oils and additives. Always follow the recommended dosage and service interval guidance on the label.

• Compatible with conventional and synthetic oils in most engines.
• Non-clogging formulation minimizes filter and passage risk.
• Safe for use in gasoline and diesel vehicles when dosed correctly.

Which types of leaks and components can BlueDevil repair?

This stop leak additive is versatile: it treats leaky crankcases, pinion seals, axle seals, gearboxes, and refillable shock absorbers. It is best for slow to moderate oil seepage, drips from older seals, and seal hardening or shrinkage. Larger mechanical failures like torn seals or severe gasket separation may still require part replacement.

• Useful for pinion seals, axle seals, and differential leaks.
• Works on gear cases, gearboxes, and refillable shocks.
• Effective for slow weeps and drips caused by aged seals.
• Not intended to replace repairs for major mechanical damage.

Who is this for? BlueDevil 49499 Oil Stop Leak is aimed at DIYers, fleet managers, and mechanics who need a quick, low-cost way to address persistent oil seepage without immediate part replacement. It fits owners of older vehicles with hardened or shrinking seals, technicians who want a temporary or long-term seal solution, and anyone looking to avoid frequent top-offs while planning a repair. For best results, inspect the leak location and follow dosing instructions for your engine size; if the leak stems from a torn or missing seal, physical repair will still be required.