10 Best Oil Additive For Engine Knock 2025 in the United States

The Sea Foam SF-16 Motor Treatment is a popular oil additive for addressing engine knock. This product comes as a 3-pack, each holding 16 fluid ounces, totaling 48 fluid ounces. It's designed as a foam, which is an interesting form that can be easily added to your engine oil.

One of the major strengths of this product includes its versatility in treating various engine issues beyond just knocking, like cleaning fuel systems, lubricating upper cylinders, and reducing engine noise. It contains detergents and dispersants to help clean and prevent deposits, friction modifiers to reduce wear, and anti-wear agents for better protection of engine components. The product also works well with both gasoline and diesel engines, which adds to its versatility.

However, it's important to note that it does not contain octane boosters, which can be a downside if you specifically need to improve your fuel's octane rating to address pre-detonation issues. Also, while it conditions seals to some extent, it may not be as effective as products specifically designed for seal conditioning. The Sea Foam SF-16 is a good choice if you're looking for a general engine treatment and cleaner, but if you need a solution specifically targeted at increasing octane or conditioning seals, you might need to look at other options as well.

The Liqui Moly MoS2 Anti-Friction Engine Treatment is a notable oil additive designed to enhance engine performance by reducing friction. This product is universally compatible with different types of motor oils, making it versatile for a wide range of vehicles.

One of its main strengths is its ability to form a high load-bearing film on all friction surfaces, which significantly reduces engine wear and tear. Users report that it can make engines run smoother and quieter, even at high RPMs, which is impressive for an oil additive. The product's flash point is 181 degrees Celsius, indicating good thermal stability.

It holds the #1 rank in Engine & Oil Fluid Additives, showing its popularity and effectiveness. If you are specifically seeking to reduce engine knock and improve engine smoothness, this product is a strong contender.

The Lucas Oil LUC10131 Pure Synthetic Oil Stabilizer is designed to enhance engine performance, making it suitable for users seeking to minimize engine knock and improve oil efficiency. One of its standout features is the ability to virtually eliminate dry starts and excessive wear, which can be especially beneficial for older engines or those frequently used in demanding conditions. The product claims to extend both oil and engine life, stabilizing oil pressure and lowering oil temperature—important factors in maintaining engine health.

In terms of formulation, it includes vital components like viscosity improvers and friction modifiers, which help enhance the oil's performance under various conditions. Additionally, its ability to eliminate issues like rough idle and poor fuel economy can be a major plus for daily drivers or those using motorcycles regularly.

There are a few drawbacks to consider. While it's a universal fit for various automotive applications, including motorcycles, it may not perform as effectively in all engine types, so users should check compatibility. Some users might find it more expensive than traditional oil additives, which can be a consideration for budget-conscious consumers. Additionally, while many appreciate the benefits it offers, those looking for a quick fix for severe engine knocking might be disappointed, as additives typically work best in conjunction with proper maintenance and care.