The Don—November 13, 2025✓ Verified purchase
Best penetrating oil on the market by far! I've been using it since the 1960s when it was only available to industry. I'm glad it's readily available to all of us today. It really does lossen frozen fasteners in cars, boat engines, motorcycles, farm equipment, ect. I also works as a firearms bore cleaner when mixed into bore cleaning solvents (25% Kroil/75% Bore solvent.) The Kroil "creeps under metal fouling in the barrel rifling loosing it for easy removal. Kroil is just "Good Stuff" Read more
Neil Massee—January 25, 2026✓ Verified purchase
My dad had a can from the time I was small, it was great, the new stuff looks different but seems to work even better. This stuff is great. After spending weeks on a stuck screw, tried everything to no avail. In one night of this the screw came out easly. Read more
john f—December 21, 2025✓ Verified purchase
this is the good stuff. no need for a spray can . this does the job and can lasts a long time. Read more
Jimbo61—February 21, 2026✓ Verified purchase
Kroil in its original form. Oil yes. You squirt it or drip it from this easy application can. Best value for the money form. This form lasts longer than aerosol spray. It drips out no noise. Read more
Jeff—October 15, 2025✓ Verified purchase
I’ve used a lot of penetrating oils over the years, but Kroil Original really does live up to the legend. I’ve been using it on your run-of-the-mill rusted nuts and bolts, and it works like magic. A few drops, a little patience, and things that should’ve snapped loose years ago finally start moving again. They say Kroil is made by squeezing leprechauns - and after seeing how it creeps into threads and breaks loose rust, I’m starting to believe it. The drip can make it easy to apply precisely where you need it, without wasting half the can in overspray like aerosols. It’s not cheap, but a little goes a long way. If you’re working on anything that’s been sitting in the elements - old cars, farm gear, or just corroded fasteners - this stuff is worth every penny. Read more
Beercan—March 7, 2026✓ Verified purchase
A little pricey but works fine Read more
RW Alexander—February 24, 2026✓ Verified purchase
Good idea to own. Use sparingly. Clean area first before use (wire brush metal and a solvent rinse). No reason to overuse KROIL. In concert with 50/50 Acetone/Synthetic ATF it’s a one-two punch to go after corroded fittings/fasteners. Read more
William H.—January 6, 2026✓ Verified purchase
Worked like a champ, it freed up a frozen choke in my shot gun barrel. Kroil Penetrating Lubricant was recommended, After letting it soak a while it spun out nearly effortlessly. Read more
