Kroil Original Penetrant
Loosen frozen metal parts the professional way, with Kroil Original Penetrant in liquid and aerosol (formerly AeroKroil) formulas.
When it comes to freeing corroded items in tough spaces, nothing rivals powerful, industry-proven Kroil penetrating oil. Used and trusted by pros and experienced DIYers alike since 1939, Kroil quickly loosens rusted nuts and bolts, frees frozen shafts, pulleys, and more. No space is too tight to reach, thanks to Kroil’s ability to penetrate into spaces as small as one-millionth of an inch. Corrosion meets its match, as Kroil dissolves and prevents rust, cleans and lubricates, and displaces moisture.
Available In
Drip: 8oz
Aerosol: 10oz, 13oz, 16.5oz
Liquid: 1gal, 5gal, 15gal, 55gal
Attacks Corrosion
Frees bolts, fasteners and other mechanical components
Removes Rust and Carbon Deposits
Will not attack or damage metal
Penetrates Faster
Penetrates quicker and deeper than similar products
Works Everywhere
Use on any corroded threads or tight parts
Simplifies Repairs
Makes the toughest maintenance jobs easier, faster and safer to execute
Penetrates Deeper
Penetrates into spaces as small as one-millionth of an inch
  • Agriculture
  • Automotive
  • Aviation
  • Construction
  • Electrical
  • Facilities Maintenance
  • Factories
  • Firearms
  • First Responders
  • HVAC
  • Industrial
  • Infrastructure
  • Lumber
  • Manufacturing
  • Maritime
  • Mechanical
  • Metal Fabrication
  • Military
  • Mining
  • Oil & Gas
  • Plumbing
  • Utilities
  • Transportation
Maintenance Tips
Hacked Off
Use Kroil Original Penetrant on saw blades and teeth to keep equipment from jamming, and ensure smooth, clean cuts. Also works well with honing and lathe equipment.
Out to Sea
Salt water and high humidity can wreak havoc on marine engines. Apply Kroil Original Penetrant to the plugs and distributor to help your engine start right up.
The Sporting Life
Use Kroil products to clean and eliminate rust from hunting equipment, fishing rods, boat parts, car racks and other equipment that may sit for long periods and/or be exposed to the elements.
“Kroil has been the most impressive penetrating oil…I would never not have Kroil on hand for the toughest jobs”
Machinery Maintenance Supervisor, Petroleum Refining Company
“I don’t really care how much the stuff costs…a couple of squirts of Kroil just doesn’t cost that much compared to the cost of the job”
Maintenance Manager, Power Company
“Kroil is the penetrating oil that I swear by. If you use it on a seized part, it is guaranteed to come apart”
VP of Maintenance and BD, Aviation Maintenance Company
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