Ratings may include incentivized customer reviews.
What Customers Are Saying
This penetrating oil is widely praised for its exceptional performance in loosening and freeing up rusted, stuck, or seized fasteners, bolts, and other hardware. Users consistently report successful results across a variety of applications, including firearms, vehicles, machinery, and household items. The product is also noted for its lubricating and cleaning properties, leaving surfaces shiny and clean. Many reviewers emphasize this as a must-have product, especially in areas prone to rust and corrosion.
Customer review summary generated by AI, including incentivized reviews.Great for cleaning guns
Would RecommendPrevents rust and easily removes rust. Also works great as a lubricant.
From kroil
Best penitrating oil ever
Would RecommendI learned of Kroil penitent years ago when I was working in factory maintenance. I restore old cars in my spare time and Kroil has been an invaluable tool in my arsenal of rust warfare. I would highly recommend Kroil to anyone wanting to break loose rusty bolts and avoid the hassle of drilling and retapping bolt holes.
From kroil
A must to have in your workshop
Would RecommendI first used Kroil in the steel mills (Bethlehem) the mechanical dept. I have a 1931 Ford Roadster that I have used Kroil numerous times. A can of Kroil comes in handy working on firearms, fishing reels, boat motors and even the family washing machine. It works!
From kroil
8 Oz oil
Would RecommendThe penatrating oil is really good , i would recommend this product for stubborn screws and nuts
From kroil
Stuck bolts no more
Would RecommendDoes wonders on old sized suspension parts, that refused to budge previously despite soaking for days in other penetrating oils
From kroil
Great Product !!!
Would RecommendI’ve been using Kroil since I started working on cars back in high school @ Boys’ Tech High School - 1975
From kroil
It has worked for me for over 30 years
I’ve been using this product for years. They’ve been a trading oil I’ve ever used.
From kroil
Amazing
Would RecommendNo broken studs anymore, a couple drops a little time and bingo it all comes loose.
From kroil
Works like a charm
Would RecommendBest stuff there is to release stuck nuts and bolts
From kroil
The Original Kroil Drip Penetrant Has No Equal
Would RecommendMy dad worked as a millwright for many years primarily in power plants and paper mills. He came across this product from a salesman in the 1970’s and brought a sample can home. We couldn’t believe how well this worked in freeing rusted bolts. Our biggest test was on an old Continental Red Seal welding engine that had severely rusted and seized exhaust manifold bolts. They had rusted badly, the engine had been left outside for years and the manifold was cracked. We decided to coat the bolt heads...
From kroil
Fantastic!
Would RecommendThe best penetrant on the market PERIOD it’s the only that I’ll use
From kroil
Nothing beats broil!
Would Not RecommendNothing is better than kroil oil penitent. And it smells good too!
From kroil
Great creeping oil
Would RecommendI’ve been using Kroil since I started work in a glass plant In 1978. My particular job was to maintain a 3000 degree glass furnace. When the burner tips would burn out we had to unscrew them and replace. Kroil was all we used to do this. Been using it ever since.
From kroil
Kroil, a firearms collector's best friend.
As a collector of curio and relic firearms, I have been using Kroil penetrant for over 20 years to free up heavily fouled and rusted actions. I apply Kroil before attempting first time disassembly of all firearms with great results. With many vintage firearms, replacement parts are often impossible to find. I find Kroil to be the best penetrant on the market to restore old firearms. A can of Kroil is always on my bench top.
From kroil
Great oil
I have been using this oil for many years in the gun shop to loosen frozen and/or rusted gun screws. Apply and let it soak sometimes days until it works its magic on the screws. Saves damaged screws.
From kroil
Great for factory's or home!
Would RecommendI've been using Kroil for 8 years now and it has never disappointed at its ability to break rusty and seized parts.
From kroil
Best there is
Would RecommendIve been using kroil for over 30 years. Best penitrating liquid Ive ever used .
From kroil
I love this stuff!
Would RecommendI have been using my Kroil on everything from frozen bolts to stuck batteries in flashlights and it is great. I'll never be without it again!
From kroil
Best stuff for rusty bolts
[This review was collected as part of a promotion.] i have used the stuff & love it. After soaking for awhile they come right loose.
From kroil
The best penetrating fluid ever
Would RecommendI first bought Kroil 20 years ago when I worked in a machine shop. I got it in the company store. Started using it immediately on all my guns to clean and lubricate them. Kroil has been a benchrest shooters secret for decades, and I had to see if it lived up to the hype. It did! It will lift carbon, fouling and other residue leftover from shooter like nothing else before or since. I lubricate the crane/yoke on revolvers and the cylinders will spin forever after this “treatment”. I have used it t...
From kroil