Kroil Original Penetrating Oil (Liquid-5 Gallon Pail-Single), Penetrant for Rusted Bolts, Metal, Hinges, Chains, Moving Parts
Kroil Original Penetrating Oil (Liquid-5 Gallon Pail-Single), Penetrant for Rusted Bolts, Metal, Hinges, Chains, Moving Parts
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Kroil Original Penetrating Oil (Liquid-5 Gallon Pail-Single), Penetrant for Rusted Bolts, Metal, Hinges, Chains, Moving Parts

5 stars out of 414 reviews
(5.0)|
414 ratings

Key item features

  • Trusted Name in The Penetrating Oils – Kroil Original Penetrating Oil from Kano Laboratories has a strong reputation among professionals as the trusted penetrating oil for any industry
  • Penetrates Faster and Deeper – Tight spaces are no problem for Kroil. It penetrates small openings, threads and crevices. So, whether you’re dealing with seized bolts, dirt bike motorcycle chains, rusty old door hinges, or stubborn garage door rollers, Kroil isn’t afraid to get in tight spots and get dirty
  • Simplifies Repairs, Magnifies Muscle – When tackling the toughest nuts and bolts, any additional leverage helps. Kroil loosens tough rusted parts fast, and requires less torque to loosen seized nuts and bolts. Now that’s leverage!
  • Attacks Corrosion, Removes Rust and Carbon Deposits – Corrosion meets its match, as Kroil removes and prevents rust, cleans carbon deposits and penetrates rusty parts. Kroil also displaces moisture, humidity and salt water, which makes it perfect for wet, humid environments
  • Made in the USA with Global Packaging – Kroil brand and Kano Laboratories were founded in Chicago, Illinois, USA in 1939 by Thomas J. O’Kane. Now located in Nashville, Tennessee, USA, we take pride in employing American workers to produce the highest quality penetrants right here in the USA
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Showing 1-3 of 414 reviews

Dec 1, 2025
Tom Broome
5 out of 5 stars review

How I learned about Kroil Original Penetrant

Back in the 1960's when I was a kid, my Dad would hire me to shovel metal chips out of his cutting machines. Dad had a small machine shop that employed two and sometimes three people. I would shovel chips out of each machine and then oil the machines with different lubricants. That was my job for a couple of days after school. I learned a lot about maintenance of machine tools. One day, I bought an old three speed bicycle so I could get back and forth from school to job. It was old, rusted, and needed some TLC. I needed to change the tires and tubes so I did, after I got done with my job at the shop, but could not get the wheel off the bicycle frame because of rust on the axle bolts and nuts. My Dad was an avid Kroil user and taught me how to use this penetrant. My Dad always bought the gallon cans and filled an old Eagle metal pump oiler that had Kroil printed on the can. He told me to squirt a little of this oiled on the threads and wait a couple of minutes so that the oil could creep into those thread and and break-up the corrosion between the nuts and threads. WOW, it worked! All four axle nuts came off so easy. When I took over the family business in 1982, I made sure we always had the Original Kroil in stock. But then I discovered aerosol SiliKroil and that became a standard in the shop too. It works just as well as the original Kroil but has so many more applications. We machine a lot of aluminum and when we don't use a coolant, we use SiliKroil as a cutting oil on the dry lathe. It works so much better than Kerosene and smells a whole lot better. All the other machines use a water base coolant. If I'm hand drilling a piece of metal, I always lube it up with SiliKroil because it cuts down on the drill wear and the drill won't grab as you drill through the metal piece. We are still using the same old push lawn mower Dad purchased back in the early 1960's to mow the shop lawn. But I noticed one day it was getting hard to pull and excessive black smoke was coming out of the little muffler exhaust. I thought there goes the piston rings. I was placing a shop order through my supplier and noticed Kreen was a gas treatment, so I ordered a gallon. Mixed it in with the gasoline and over a couple of weeks I noticed that it was easier to pull start and very little black exhaust coming out of the muffler. Again, I was impressed! You got to love those Briggs and Stratton engines! I've been an avid fan of Kroil products since 1965 and will continue to use Kroil products as long as I am still the shop owner. And by the way, I'm still using that Eagle pump oiler with the original Kroil penetrant in it!

Review from kroil
Helpful?1CNJAXFVD3HC176282280
Dec 2, 2025
UpStater
5 out of 5 stars review

Kroil has been working longer than I can remember

I am 75 years old and have been using Kroil as my go to penetrant for as long as I can remember. When the situation calls for a product to attack rusted connections I go to the "orange can" on my shelf without hesitation.

Review from kroil
Helpful?1CNJAXFVD3HC176282280
Nov 18, 2025
CrankyDan
5 out of 5 stars review

Just what the mechanic ordered

Was on my way to auto zone to pick up a can of penetrate as I was working on some stubborn automotive rusted fasteners. As I turned the corner to AZ lo and behold someone had lost a small box of items right in my pathway, stopped and saw my first can of kroil, partially opened and dripping on ground. Decided to take it home without making a purchase at AZ and it worked really good on the fasteners as stated. Very good product, will purchase more as needed. First experience with this item, really works fine!

Review from kroil
Helpful?1CNJAXFVD3HC176282280