9 Best Penetrating Oils for Rusted Bolts

Have you ever tried to remove a bolt from a car and had it refuse point blank to move even a millimeter due to rust or old age? If you have then you know how annoying this situation can be.

Don’t despair however, because these days you can find new types of penetrating oils that make removing jammed nuts, hinges or bolts effortless and safe.

Any mechanic will tell you that rust can be a difficult problem, and rusted or seized parts can be difficult to remove and replace. Having a good-quality penetrating oil can save you time and effort and make the process of removing bolts, screws and nuts, a cinch.

But which one should you buy out of the many different ones on the market today? To help answer that question, here are 10 of the best penetrating oils to remove rusted or seized bolts.

Top 9 Best Penetrating Oils to Remove Seized Bolts

1) Kano Aerokroil Penetrating Oil

For the toughest rusted bolts, it’s hard to beat Aerokroil. It’s arguably the best penetrating oil ever made despite it being one of the pricier oils on the market. It’s easy to use aerosol and patented lubricating technology eases tension in all metal joints, reducing friction with ease by attacking rust but leaving the base metal beneath untouched.

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2) Kano Sili Kroil Penetrating Oil

Kano Sili Kroil is another excellent choice for penetrating rust and loosening bolts and joints. It doesn’t work quite as well or as quickly as the Aerkroil above but what it does do extremely well is provide the metal with a water-resistant coating that prevents further corrosion down the line and it does this at a low price point to boot.

Another added advantage of the Kano Sili Kroil is that it comes with a straw making it easy to reach those tighter spaces some other oils struggle to reach.

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3) Liquid Wrench Penetrating Oil

Liquid Wrench is one of the best regarded penetrating oil brands in the world, and L112 11-ounce can is easily their most well-known product.

As far as rust removal goes, Liquid Wrench has unmatched performance, and its patented formula has seen many improvements over the years resulting in the respected product it is today.

Whether you want to lubricate moving parts, free a rusted bolt, unfreeze a lock or get rid of the grease within a pipe or hose, the product can tackle it all.

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4) B’laster Penetrating Catalyst

B’laster is another well-known penetrating oil product due to its price point and effectiveness.

A problem that’s commonly associated with penetrating oils is how they evaporate quickly, thus making them ineffective to lubricate surfaces long term. B’laster is different as it creates a non-evaporating film that remains on surfaces longer and provides a lubricant for moving parts.

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5) Gasoila Free All Rust Eater

Gasoila Free All spray is made with adaptability in mind. Whether it’s a hinge, bolt, fence, gate, or any other metal object, this rust removing penetrant will not only remove the rust, but free the object too.

On top of this, Gasoila Free All deep penetrating oil is incredibly good at getting rid of white and red lead, carbon, graphite, tar deposits and scale. On top of this it doesn’t contain silicones or other harsh chemicals, making it safer for the environment than some of its competitors.

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6) CRC Knock-er Loose Penetrating Solvent

CRC Knock-er Loose is a real powerhouse. The patented formula features a mixture of chemicals that will lower the surface tension on every rusted or jammed metal item you throw at it whilst protecting the metal underneath.

Because of its incredibly low viscosity, this solvent is able to reach into the tightest of spaces, loosening and lubricating surfaces with ease. Perfect for loosening rusted or corroded bolts and frozen metal components.

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​7) Castle Thrust Penetrating Oil

The unique selling point of Castle Thrust Penetrating Oil is it’s a unique ion activated formula that prevents it burning off making it highly effective on metal parts subject to high temperatures.

This foam based solvent sticks to metal with ease and penetrates even the smallest of gaps making it ideal for auto-mechanics.

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8) WD-40 Specialist Rust Releast Penetrant

We come to probably the most famous brand on the list. WD-40 is one of the handiest multipurpose products ever made and its many applications, ranging from lubricating metal surfaces to removing rust, have seen it sell millions of cans all over the world.

The name WD40 stands for water displacement 40 and as it suggests it is a great product for displacing moisture and as a result attacking and protecting from rust. This “Specialist” spray is specially formulated to penetrate rust and corrosion to get the toughest nuts and bolts unstuck.

Comes attached with a permanent straw and its unique two-way spray system allows it to be used upright and upside down allowing it to reach places other lubricants cannot reach.

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9) 3-IN-ONE Multi-Purpose Oil

The 3-IN-ONE Multi-Purpose Oil is one of the oldest penetrating oil brands on the market and as a result has benefited from years of experience and tinkering by its manufacturer.

This multipurpose drip oil can be used by both DIYers and mechanics and has a wide range of functions, including lubricating, cleaning and protecting metal tools, and clearing and preventing rust.

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