10 Best Oil Additives To Stop Leaks 2025 in the United States

Bar's Leaks Jack Oil with Stop Leak - 12.5 oz is designed to stop current leaks and prevent future ones, making it a practical solution for maintaining floor and bottle jacks as well as snow plow fluids. This product stands out due to its compatibility with all types of petroleum-based, mineral oil, and synthetic fluids, which means you won't have to worry about compatibility issues. The non-corrosive, non-clogging, and non-foaming properties ensure it won't damage your equipment or create additional problems during use.

While it ranks well in its category (#59 in Engine & Oil Fluid Additives), it is not the top product, indicating there may be other additives with higher performance or additional features. Additionally, the emphasis on its anti-wear properties suggests its primary function is to prevent wear and tear rather than to clean or disperse contaminants. This might not be the best option if you are looking for a multi-functional additive that also cleans. Bar's Leaks Jack Oil is a reliable choice for those specifically looking to address and prevent leaks in hydraulic systems.

The Lucas Oil 10009 Transmission Fix is a highly regarded transmission problem-solving additive designed to stop leaks and extend the life of transmission fluid. One of its major strengths is that it does not contain solvents, making it a safer option for your vehicle's internals. You can easily add it to your existing transmission fluid without the need to drain any out, which is convenient and saves time.

This product is especially effective for motor homes and commercial vehicles, and it can extend the life of your transmission fluid up to four times longer, reducing the need for frequent fluid changes. It also offers additional protection to planetary gears and improves shifting ease in worn transmissions. However, it's important to note that it is not recommended for CVT transmissions and dual-clutch vehicles.

Be mindful that in larger or heavily worn transmissions, you may need to use a second bottle for optimal results. For smaller vehicles, a smaller 12 oz. bottle is recommended. With its strong market presence, Lucas Oil 10009 Transmission Fix is a reliable choice for those looking to maintain or improve their vehicle’s transmission performance.

Bar's Leaks High Mileage Power Steering Repair-It is an effective solution for common power steering issues, especially for older vehicles. This 16.9 oz bottle contains a blend of performance additives designed to reduce noise, smooth out hard steering, and stop leaks by reconditioning the rack and pinion. It is compatible with all types of power steering fluid and ATF, including petroleum, mineral oil, and synthetic formulas, making it versatile for use in domestic and import vehicles.

Users appreciate its dual cavity bottle, which helps in addressing various power steering fluid-related problems effectively. Additionally, it can be used to top off existing fluid or added during fluid changes to restore performance and add protection to the system. Despite its strong performance, some users might find it less effective on severe leaks or heavily worn systems.

This product is ideal for vehicle owners looking for a quick and relatively easy solution to improve their power steering system's performance and extend its lifespan. However, potential buyers should note that while it works well in many cases, it may not be a permanent fix for major mechanical issues.