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.Amazing
Would RecommendFrees up locked bolts Loosened up oxygen sensor to replace
From kroil
Good stuff
Would RecommendThis stuff is amazing. When others can't seem to get the results your looking for from a penetrating oil. Kroil will. Plain and simple. It works.
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The Best
Would RecommendI started using this years ago when my brother introduced me to it and continue to show it to new mechanics. I’ve never had one that said they didn’t love it!!
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Work bench necessity
Would RecommendA necessity for deep cleaning firearms! I was introduced to this product by my Uncle in 2010 after complaining of cleaning stubborn rust on a neglected military surplus rifle. I've never looked back since. The penetration into rust this light oil made was astounding. I've had a can handy all these years later and will continue to. I've told people about it for years and only had a couple know what I was talking about. My only complaint is they changed the can, I thought the old one looked better...
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It was a good price and free shipping.
Would RecommendI love the product, but the can had a significant dent on bottom left corner. fortunately it isn't leaking (yet). Could have been packed much better.
Verified Purchaser
This product is great for hard stuck fasteners and rusted frozen stuff
From kroil
AMAZING STUFF
I have been using KROIL for over 40 years, currently in restoring/derusting a century-old vintage Harris Tweed [Hattersley] weaving loom from the Outer Hebrides of Scotland. A hard bristle toothbrush and Kroil actually makes the restoration process enjoyable [!] as rust dissolves before your very eyes [!!]
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I'm a Kroil man
Would RecommendI learned about and started using Kroil in the mid 70s. It's not only the best penetrating lubricant, but also the best smelling oil on the market. I sometimes use it for cologne. It's really just that good; the ladies love it!
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Removes barrel fouling
Would RecommendI’ve been using Original Kroil for years to remove fouling from my pistol barrels. About an hour after application, I scrub the bore with a bronze brush wrapped in bronze wool. Kroil does the trick!
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Best for rust
Would RecommendDecided to try it after hearing good reviews. Definitely worth it works great on rusty bolts breaks them free like nothing after soaking in the kroil.
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Things Come And Go But Kroil Is Still The Best
Would RecommendNothing better for cleaning firearms. I've used this with JB Bore paste for almost 50yrs. Best thing out there for rusty bolts as you can drip it right where you need it. Great for air tools.
From kroil
Magical Stuff
Would RecommendI do HVAC, and quite often I find myself having to change furnace bower motors or A/C condenser fan motors. Both of which can get stuck on the motor shaft, but condenser fan motors being outside in Michigan sure do take a beating. The hub of the fan blade can rust to the motor shaft so bad it appears it's all one piece, but drip some magical Kroil onto it, let it sit, and pull it right off! Amazing!
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Excellent penetrant for machining.
Would RecommendI use this all around in my shop. By far one of the best to have in a small machine shop.
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Rust Bolt
Bought this recently to remove an old rusty bolt. Worked great!
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WORKS FOR EVERYTHING!!
Would RecommendThis is the one product that has to be in your garage! It’s so versatile and what’s even better is that it actually works! I tried SO MANY different things to try to clean the carbon out of my secondary air diverter system and nothing works work. Nothing except Kroil that is! I’ll NEVER use an anything else ever again! I just wish more places carry it! FAVORITE PRODUCT EVER!!
From kroil
Best penetrant ever.
Would RecommendThis is the go to for stuck parts and fasteners. Never failed.
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Original KROIL
Would Recommend[This review was collected as part of a promotion.] This is the best I know of. I know this helps loosen the stuck'est fasteners & overtightened then corroded bike parts.
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Awesome stuff!
I have worked in the Oil Industry for 36 years, we have used Kroil to loosen up stuck isolation valves. It's a miracle product.
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Gun restoration and precision shooting
Would RecommendHi Folks watched many vids on the Gun - restoration Mark Novak channel on youtube - he is absolutely convinced by the capability of Kroil penetrating oil. Many benchrest and other serious shooters use the combo of Kroil an J-B Bore Pastes to have a spotlessly clean bore for precision shooting and conservation. Greets Joe
From kroil
Great rust remover
Would RecommendWorks very well
Verified Purchaser