10 Best Oil Additives 2025 in the United States

The LIQUI MOLY Oil Additive Cera Tec 20002 is a solid choice for those looking to enhance their engine's performance and longevity. One of its standout features is its ability to mix well with all commercially available motor oils, making it versatile for various vehicles. Users will appreciate the smoother engine performance, reduced friction, and potentially lower fuel consumption that this additive offers. It also boasts impressive thermal stability, working well under both high and low temperatures, which is essential for engine protection during extreme conditions.

In terms of its formulation, the presence of effective components such as viscosity improvers, detergents, and anti-wear agents enhances the protection and efficiency of the engine. This makes it particularly suitable for individuals who frequently drive in demanding environments or those who want to maintain their engine’s health over time.

While this oil additive has many strengths, potential drawbacks should be considered. Some users may find the price slightly higher compared to other oil additives, which could be a consideration for those on a tight budget. Additionally, while it claims to be compatible with various filter systems, some users may still experience concerns about compatibility with specific oil types or brands.

The Lucas Oil 10002 Heavy Duty Oil Stabilizer is a well-regarded oil additive, especially popular among car owners looking to enhance their engine performance. One of its main strengths is its formulation with 100% petroleum, which many users find effective in improving engine lubrication and overall efficiency. This product serves multiple purposes due to its blend of viscosity improvers, detergents, anti-wear agents, corrosion inhibitors, friction modifiers, and seal conditioners. These features make it suitable for both new engines and ones operating under high-stress conditions, appealing to a wide range of vehicle types.

On the downside, while the product is versatile, some users may find the oil stabilizer somewhat on the pricier side compared to other additives. Additionally, while it is suitable for a variety of vehicles, those with older engines might want to proceed with caution, as some components may not be ideal for all engine types. Furthermore, the heavy 1-gallon container may be cumbersome for casual users who only need a small amount for their oil changes.

The Lucas Oil 10002 Heavy Duty Oil Stabilizer is an effective, multi-use product that is particularly beneficial for car owners seeking to enhance engine performance and longevity. However, potential buyers should consider their specific vehicle needs and whether the investment aligns with their maintenance routine.

The Marvel Mystery Oil MM14R-4PK is a versatile oil additive that offers several benefits for maintaining your vehicle's engine. One of its key strengths is its ability to lubricate the entire fuel system, including fuel pumps, injectors, and carburetors, which can help improve fuel mileage by reducing internal friction. This can be particularly beneficial for those looking to enhance their vehicle's performance and extend the life of vital engine components that fuel alone may not adequately protect.

Additionally, using this product can help extend the life of spark plugs, which is a nice bonus for regular vehicle maintenance. However, it is worth noting that this additive does not comply with federal low sulfur content requirements for use in 2007 and newer diesel motor vehicles, making it unsuitable for newer diesel engines. The low flash point of 53 degrees Celsius might also be a consideration for safe handling and storage.

Despite these points, the Marvel Mystery Oil remains a strong contender for those looking to improve their vehicle's fuel system lubrication and performance.