10 Best Oil Additives To Stop Leaks 2026 in the United States

Bar's Leaks OS-1 Seal Engine Oil Burning/Leak Repair is a versatile product designed to address oil leaks and reduce oil burning in a wide range of gasoline and diesel engines, including turbocharged and hybrid models. This product is suitable for various vehicles such as cars, trucks, vans, and SUVs, as well as heavy-duty applications like tractors and boats. Its universal fit makes it highly compatible and easy to use for many different engine types.

One of its key strengths is its ability to renew worn valve seals and guides, which can significantly reduce blue exhaust smoke and oil consumption if your vehicle is not consuming more than one quart of oil per day. Being made in the USA adds a level of trust and reliability to its quality. The product may not be as effective for extremely high oil consumption cases, and its concentration and combination of additives may not be suitable for all engine conditions.

Bar's Leaks OS-1 is a solid choice for those looking to stop oil leaks and reduce oil burning in a variety of engines, provided the oil consumption is moderate.

The Lucas Oil 10018 Hydraulic Oil Booster & Stop Leak is presented in a 1-gallon pack of four. This product is manufactured by Lucas Oil and is designed for use in various hydraulic systems, such as automatic transmissions, power steering units, and more. This additive boasts several essential features for stopping leaks: it contains seal conditioners to rejuvenate old seals, viscosity modifiers to maintain an optimal oil thickness, and detergents and dispersants to keep the hydraulic system clean.

The product is made from materials like Polytetrafluoroethylene and Molybdenum Disulfide, which can aid in reducing wear and tear in hydraulic systems. It has a substantial package weight of 32.6 pounds, and the considerable volume of 4 gallons could be more than enough for extensive use. However, its larger package size might be cumbersome for some users to handle.

Additionally, the extensive range of compatible applications makes it versatile. While it is not a new product (released in 2012), it remains in production, suggesting a consistent demand. The oil additive stands out in its category, ranking #137 in Engine & Oil Fluid Additives on Amazon. Despite its strengths, potential users should ensure compatibility with their specific systems to avoid any mishaps. Its weight might also be a concern for those looking for a lighter option.

The BlueDevil Products 49499 Oil Stop Leak is an easy-to-use solution for those dealing with oil leaks in their vehicles. Simply pour the recommended amount into the oil slump or crankcase, making it user-friendly even for those without extensive automotive knowledge. It promises a permanent seal for leaks, which means you won't have to reapply it frequently.

This product stands out in its category due to its compatibility with both gasoline and diesel engines, making it a versatile choice for many different types of vehicles. Additionally, it is designed to repair and recondition rubber seals throughout various fluid oil systems, including pinion seals, gear cases, and gear boxes, adding to its versatility. The non-clogging formula is safe for your engine, as it does not contain harmful petroleum substances.

However, it's important to note that while it is marketed as a permanent solution, the effectiveness may vary depending on the severity of the leak and the condition of your vehicle. Also, the bottle contains only 5.87 fluid ounces, which might not be sufficient for larger applications. This product is beneficial for users seeking an easy and comprehensive solution to oil leaks, particularly if they own multiple types of vehicles.