10 Best Engine Oil Additives 2025 in the United States

The Lucas Oil 10002 Heavy Duty Oil Stabilizer is designed for multiple vehicle types and promises to enhance oil performance in several ways. This product notably increases oil life by at least 50%, which means fewer oil changes and potential cost savings. It also reduces oil consumption, making it a great choice for vehicles that tend to burn oil quickly. The eliminations of dry starts can be particularly beneficial, as it ensures that the engine is well-lubricated from the moment it is started, reducing wear and tear over time.

Additionally, the stabilizer raises oil pressure, which can improve engine performance and efficiency. Users have also reported increased power and better fuel efficiency, which are significant advantages for any vehicle owner looking to optimize their vehicle's performance and save on fuel costs.

On the downside, while the product performs well in enhancing oil properties, it may not contain specific detergents, friction modifiers, or seal conditioners. As a result, users looking for comprehensive engine protection might need to use additional products to meet these needs.

The Archoil AR9100 Oil Additive is a versatile engine oil additive designed to enhance the performance and longevity of various engine components. This 16oz additive is suitable for both diesel and gasoline engines and can be used in gearboxes, hydraulics, differentials, and power steering systems. One of its key strengths is its ability to fix cold start injector problems in 6.0L and 7.3L Power Stroke engines, making it particularly beneficial for Powerstroke diesel owners.

Additionally, it helps reduce engine noise, vibration, and heat, while also decreasing wear and extending the life of engine components. The additive's friction-modifying properties help improve engine performance, while its anti-wear agents and corrosion inhibitors protect vital engine parts from damage.

The Archoil AR9100 seems to be a solid choice for improving engine performance and longevity, especially for those dealing with Powerstroke diesel engine issues.

The Archoil Ultimate Diesel Kit is specifically designed for diesel vehicle owners who want to maintain and enhance their engine’s performance. This kit includes three key products: the AR9100 Friction Modifier, AR6500 Diesel Treatment, and AR6400-D Diesel Fuel System Cleaner. These products work together to improve engine efficiency, clean the fuel system, and boost fuel quality. The AR9100 Friction Modifier helps reduce wear and friction within the engine, contributing to a smoother and longer-lasting performance.

The AR6500 Diesel Treatment is meant to be used at every fill-up and is capable of treating up to 400 gallons of fuel, making it a cost-effective choice for regular maintenance. The AR6400-D Diesel Fuel System Cleaner rapidly cleans the fuel system, ensuring optimal engine performance and fuel efficiency while also providing a cetane boost, which can enhance combustion and power output.

One potential downside is the initial investment cost, as purchasing the entire kit may be more expensive compared to individual treatments. However, the comprehensive benefits and the fact that it addresses multiple aspects of engine care make it a valuable option for those committed to maintaining their diesel engines in top condition. The kit's design and packaging also make it easy to store and use. The Archoil Ultimate Diesel Kit is a highly recommended product for diesel vehicle owners seeking a comprehensive solution to engine maintenance and performance enhancement.