The Best Penetrating Oil For Your Rusty Nuts Or Bolts – What You Need To Know

Penetrating oil is a liquid with very low viscosity. Its main function is to loosen the mechanical parts that have ​rusted, so they can be easily removed and replaced. The product is capable of getting into ​narrow spaces where the threads of the rusted parts meet. ​Penetrating oil is very versatile: you can use it as a lubricant, a corrosion preventer, and a cleaner.

​Below are some of the best penetrating oils ​you can ​buy.

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Functions Of Penetrating Oil

The primary function of ​penetrating oil is to loosen corroded, frozen or seized fasteners. It is low in viscosity ​which enables the fluid to move and enter into crevices, pores, and threads​.

Most ​penetrating oils are combined with a lubricant and a solvent, with a primary role to reduce its viscosity and thin down the lubricant. Other functions of the penetrating oil are as follows:

best penetrating oil

As a short-term lubricant. The oil reduces ​friction coefficients, but ​as it contains solvents, it is ​volatile, evaporates easily, and gets contaminated fast, ​leaving ​only a thin film. Choose penetrating oils with additives for lasting lubrication. It should be used ​as a substitute ​to industrial lubricants because ​it does ​not offer the same rate of fatigue.

As a cleaning agent, ​penetrating oils are ideal for removing adhesives, greases, tars, and rust. The oil acts as a degreaser or solvent cleaner to remove ​contaminants. Once the product mobilizes the residue, it is easier to remove using light abrasive, tack cloth or wipe.

Resist corrosion. The oil prevents and stops corrosion. Most of the products have water dispersing features that prevent oxidation upon application by displacing the moisture.

Types Of Penetrating Oil

best penetrating oil

Via directindustry.com

1. Micro-Dispersant Penetrating Oils

This type of penetrating oil ​is fire resistant and has solid lubricant particles that are found in a natural or synthetic oil base. The particles can be any type of solid lubricant. Examples of this are ​boron nitride, graphite, and polytetrafluoroethylene. The oil base can be any kind of liquid oil.

2. Straight And Soluble Oil Fluids

This sort of penetrating oil is very common for mechanical ​uses. It has high water content that improves its resistance to fire. Soluble oil with high water content should be used where there is a high risk of ​the oil igniting.

Top 3 Best Penetrating Oils

**Below, you'll see more detailed reviews, but you can also click the links above to see current prices and read customer's reviews on Amazon.

Kano Kroil Liquid Penetrating Oil

Via Amazon

Kano Kroil is a popular penetrating oil that loosens ​stuck metal parts. The product ​uses a scientific principle that reduces the surface tension so it can penetrate into openings as small as 1,000,000th of an inch.


The product loosens frozen metal joints easily. It dissolves gum, oil and dried grease without damaging the metal. Kano Kroil displaces water, prevent rust and provides lubrication.

Pros

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    Easily loosens stuck metal joints
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    Lubricates stops rust and displaces water
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    Gets rid of gum, oil and dried grease without damaging the metal.

Cons

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    It is effective enough that if left on other parts, it may loosen them and cause them to fall off.

3 in One 10038 Multi-Purpose Penetrating Oil

Via Amazon

This penetrating oil is available in 8 ounces and can be used on surfaces to remove grime and grease, decrease friction, and loosen rusted metal parts. The product also eliminates the squeaking sound in ​components like ​hinges and wheels.


To control the amount of lubrication dispensed it has drip applicator. This ensures that upon squeezing the bottle, you will be able to dispense the exact amount required.

Pros

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    This product decreases the friction and eliminates annoying squeaky sounds in components like hinges and wheels.
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    The oil penetrates into crevices to free parts that have been corroded together.
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    It gets rid of grime and remove dirt.
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    Available in 8 ounces in an easy to squeeze bottle.
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    ​Has drip applicator to help dispense the right amount.

Cons

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    Problem with the loose cap that may ​cause ​oil to leak if not properly stored.

Liquid Wrench Penetrating Oil 5 oz.

Via Amazon

The Liquid Wrench Penetrating Oil gets rid of stuck bolts, nuts, and locks, and also penetrates ​grease and eliminates ​rust. This penetrating oil is anti-seize, loosens stuck bolts. It's a ​fast-acting product that prevents corrosion in ​components. With its high lubricity, low viscosity, high solvency and low surface tension, this product can sneak into the toughest rust.

This penetrating oil is recommended to solve stuck bolts, locks and a lot more. It can break through stuck and corroded parts.

Pros

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    It is a multi-purpose penetrating oil
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    It is available in a convenient aerosol container
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    More powerful, accurate spray pattern 
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    It is a fast penetrating solvent
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    Low odor
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    It loosens rusted nuts, bolts and other components within a few minutes
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    Safe on painted surfaces

Cons

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    Some users are complaining ​that the red wand ​does not fit into the nozzle
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    Not available in Catalina Island.

Conclusion

The best penetrating oil is a versatile product that infiltrates, cleanses and loosens ​corroded components. It keeps ​parts protected against corrosion and rust and cleans tar, grease, and lubricates moving parts. All these features make ​penetrating oil very useful.

The three products reviewed above have these qualities. You can choose your preferred product base on their pros and cons. Although there are three penetrating oils mentioned above, we recommend Kano Kroil penetrating oil because of its versatility and effectiveness. If you find this post helpful, you can share this with others.

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