KROIL 8 Oz. Original Penetrant Oil
$19.49
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$6.99 - $13.99
reg $16.95 - $18.99 Sale
2.7 out of 5 stars with 3 ratings
$4.99($1.43/fluid ounce)
was $5.49 New lower price
4.5 out of 5 stars with 189 ratings
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Guests are saying
Kroil oil penetrant is highly praised for its exceptional ability to loosen rusted bolts and clean firearms, making it a must-have for both professionals and home mechanics. Guests appreciate its versatility, using it for various applications from automotive repairs to restoring vintage items. Many have found it indispensable in their toolkits, often recommending it to others for its effectiveness and reliability. Its long-lasting formula ensures that a little goes a long way, making it a valuable addition to any workshop.
Summary created by AI from text of reviews reflecting recent feedback provided across different star ratings (includes incentivized reviews)
5.0 out of 5 stars with 350 reviews
5 out of 5 stars
8 January, 2026
originally posted on kroil
It works!
On the job, at home in the garage, even in the bedroom (squeaky door) IT WORKS!
5 out of 5 stars
3 January, 2026
originally posted on kroil
My experience with Kroil
[This review was collected as part of a promotion.] I have used this product for many years in my shop. It’s out standing for losing rusted nuts, screws, gun sights, and a excellent rust preventive for my firearms and tools.
5 out of 5 stars
2 January, 2026
originally posted on kroil
Great Penetrating Lubricant
Best penetrating lubricant I've used. Always does the job. Highly recommended.
5 out of 5 stars
30 December, 2025
originally posted on kroil
Great product for DIY and professionals.
Great product and cost effective. Availability is great..
5 out of 5 stars
29 December, 2025
originally posted on kroil
Great Stuff
This stuff penetrates faster than any other product I have ever tried.it also appears to loosen screws that the other penetrating oils would never touch
5 out of 5 stars
28 December, 2025
originally posted on kroil
Best penetrant there is!
Best penetrant there is, no comparison. Me and my buddies all use Kroil. We refer to it as panther pee, lol. Works where other penetrants don't.
5 out of 5 stars
24 December, 2025
originally posted on kroil
it works where others failed
I picked up an old motocross motorcycle that's been sitting for over 30 years piston was stuck very badly i just soaked the piston in Kroil over night and the product worked perfectly with no damage to the bore or piston thank you great product
5 out of 5 stars
24 December, 2025
originally posted on kroil
(no review title)
i bought this a long time ago . it works great breaking lose rusted bolts
5 out of 5 stars
17 December, 2025
originally posted on kroil
In the shop and in the field…
Used Kroil for many years. It is oftentimes a lifesaver. Especially if you can let it soak in overnight.
5 out of 5 stars
15 December, 2025
originally posted on kroil
Cracking it lose
For the past 35 years I have used Kroil penetrant to loosen that seized or stubborn fastener in progressive stamping dies and fixtures. Now in a new chapter of my career I use Kroil penetrant to loosen hardware fasteners on foundry tooling that becomes oxidized thru the constant exposure to heat and moisture.
5 out of 5 stars
11 December, 2025
originally posted on kroil
One ounce a year is all I used for a decade.
A union millwright gave me a can of krill. He told me is was the absolute best. I stretched that can out for ten years because I didn’t know where to buy it. I only use it when the my back is against the wall. My can of kroon was the only supply I would hide in my workshop to prevent others from using. I’m so happy that I can now buy kroil online now. Thank you all!
5 out of 5 stars
7 December, 2025
originally posted on kroil
Kroil
I've been using Kan o Kroil since being in the AC service industry, and as a Mill Wright. This is the best thing that I have ever found to get crusty rusty things to let loose in the industrial world. I generally buy multiple cans at a time, so I don't ever run out. Looking forward to a purchase of the spray Kroil in the near future.
5 out of 5 stars
4 December, 2025
originally posted on kroil
I've tried the rest, then I found the best
A friend loaned me his can to try on some rusted up and very stuck screws and bolts on an antique firearm. I followed his instructions and wound up letting it set overnight. The next day when I picked the piece up and applied on the slightest bit of pressure to the stuck components, they back out and with ease. I am sold on the product. Now If I can just find a store that actually has it in stock. Everywhere I have checked in my area they are out. This tells me the product is superb
5 out of 5 stars
2 December, 2025
originally posted on kroil
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.
4 out of 5 stars
2 December, 2025
originally posted on kroil
perf penetrant
Got my first tin from a gunsmith who recommended it over good old "no. 9" Have used a number of cans since, on old parts & oxidized fasteners. I like the smell, you put it on, wait a bit, and you can crank those parts loose. Went to the website to order a can for my son.
4 out of 5 stars
1 December, 2025
originally posted on kroil
Penetrater
I bought my first tin of Kroil from a gumsmith who recommended it in place of good old "number 9". Since then I have loosened many frozen parts and cleaned up many rusty fasteners. I even like the smell. Went onto the website to buy a can for my son for Chistmas.
5 out of 5 stars
30 November, 2025
originally posted on kroil
Best penetrant I've ever used
A couple drops of this stuff and within minutes it will break loose
5 out of 5 stars
24 November, 2025
originally posted on kroil
The best I've ever used.
I've been a satisfied user for over 2 decades, I only wish that I had discovered much earlier in my life!
5 out of 5 stars
18 November, 2025
originally posted on kroil
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!
5 out of 5 stars
11 November, 2025
originally posted on kroil
Always on hand
This is a staple in my shop. They say its the best thing when breaking in a new rifle barrel.