10 bestOil Additiveof June 2025
112M consumers helped this year.
6% off
1
Liqui Moly (20002) Cera Tec Friction Modifier - 300 ml
Liqui Moly
9.9
8% off
2
Archoil AR6500 Diesel Treatment (Two Pack) - Treats 800 Gallons - Additive for All Diesel Vehicles
Archoil
9.8
3
Hot Shot's Secret Everyday Diesel Treatment 16 Ounce Squeeze Bottle (HSSEDT16ZS)
Hot Shot's Secret
9.8
4
Archoil AR9100 Oil Additive (16oz) for All Vehicles - Powerstroke Cold Starts, Eliminates Injector Problems…
Archoil
9.7
5
Red Line 80204 Water Wetter -12oz. 2 Bottles
Red Line
9.4
6
Liqui Moly 2009 Anti-Friction Oil Treatment - 300 ml
Liqui Moly
9.2
7
Liqui Moly 2020 Motor Oil Saver - 300 ml
Liqui Moly
8.9
8
Liqui Moly 20004 Hydraulic Lifter Additive
Liqui Moly
8.7
9
Lucas Oil H/D Oil Stabilizer/12x1/Quart, Multi, One Size (10001)
Lucas Oil
8.4
10
*H/D Oil Stabilizer/4x1/Gallon
Lucas Oil
8.1
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A Guide to Selecting the Best Oil Additive
Choosing the right oil additive can help improve your engine's performance, reduce wear, and extend the life of your vehicle. Oil additives are designed to enhance the properties of your engine oil, but not every engine or driving style needs the same type of additive. To make the best choice, it's important to understand what each key specification means and how it relates to your specific needs, such as the age of your vehicle, the type of driving you do, and any particular engine issues you want to address.
Additive Purpose
The purpose of an oil additive refers to the main function it serves, such as reducing friction, cleaning engine parts, preventing leaks, or quieting noisy engines. This is important because different additives are formulated to solve different problems. For example, some are designed to clean sludge, while others focus on improving lubrication. When choosing, think about what you want to achieve: if your engine is noisy, look for additives that reduce noise; if you have an older engine, you might want something that helps with leaks or wear. Always match the additive's purpose to your specific engine needs.
Compatibility with Oil Type
Compatibility means whether the additive can be safely mixed with the type of oil you use, such as conventional, synthetic, or high-mileage oils. This is crucial because using an incompatible additive can reduce the effectiveness of your oil or even harm your engine. Additives are usually labeled for use with certain oil types, so check your vehicle's manual to see what oil you use, and then make sure the additive is suitable for that oil. If you use synthetic oil, for example, pick an additive that specifically states it works with synthetics.
Viscosity Impact
Viscosity impact refers to how the additive affects the thickness or flow of your engine oil. Some additives can make oil thicker or thinner, which can influence how well it protects your engine, especially in different temperatures. If you live in a cold climate, you might want an additive that doesn't thicken the oil too much, while in hot climates, a slight increase in viscosity can help. Consider your local weather and your engine's needs when thinking about this spec.
Detergent and Cleaning Properties
Detergent and cleaning properties describe how well the additive can remove sludge, deposits, and other contaminants from your engine. This is important for keeping your engine clean and running smoothly, especially if you have an older vehicle or notice signs of buildup. If your main concern is engine cleanliness, look for additives with strong cleaning claims. However, if your oil already has high detergent levels, you may not need extra cleaning power.
Anti-Wear and Friction Reduction
Anti-wear and friction reduction refers to the additive's ability to protect engine parts from rubbing against each other and wearing out. This is especially important for high-mileage vehicles or engines that operate under heavy loads. If you want to extend your engine's life or drive in tough conditions, choose an additive with strong anti-wear properties. For newer engines or light driving, this may be less critical.
Seal Conditioning
Seal conditioning means the additive can help maintain or restore the flexibility of engine seals, which can prevent or reduce oil leaks. This is particularly useful for older vehicles where seals may have started to harden or shrink. If you notice oil spots under your car or have an older engine, look for additives that mention seal conditioning. For newer vehicles, this feature is usually less necessary.
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