(Updated on April 25, 2022)
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 no matter if you have the best tool set in existence.
Having a good-quality penetrating oil can save you time and effort and make the process of removing bolts, screws and nuts, a cinch. Here are 8 of the best penetrating oils to remove rusted or seized bolts to avoid wasting money on worthless products.
Top 8 Best Penetrating Oils to Remove Seized Bolts
Aerokroil is an easy to use aerosol and patented lubricating technology eases tension in all metal joints, reducing friction with ease by penetrating through rust but leaving the base metal beneath untouched.
There’s good reason why professionals trust Kano Aerokroil over any other penetrating oil when dealing with the most stubborn fasteners (including on car and truck exhaust components). As mentioned, it’s not cheap so it may be overkill for some applications.
B’laster is another well-known penetrating oil product due to its price point and effectiveness. While it may not work as well as Aerokroil for the most stubborn rusted or seized fasteners, it still gets the job done more often than not.
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.
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, Liquid Wrench can tackle it all.
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 that, Gasoila Free All doesn’t contain silicones or other harsh chemicals, making it safer for the environment than some of its competitors.
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. CRC Knock-Er Loose is a great option for loosening rusted or corroded bolts and frozen metal components.
This foam based solvent sticks to metal with ease and penetrates even the smallest of gaps making it ideal for auto-mechanics.
Because it’s not as well-known as some others, Castle Thrust penetrating oil is a bit tougher to find. But make no mistake, it can loosen some of the most stubborn nuts and bolts and is a good alternative when lesser products fail.
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 penetrating through rust and protecting it from forming. 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. WD-40 Specialist is the perfect choice for an all-purpose lubricant and penetrating oil for around the house.
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. While inexpensive, the 8 ounce container of 3-in-One oil goes a long way.