Kroil Original Penetrating Oil

I first started using this stuff in the Air Force. In my opinion it saturates seized but and bolt threads better than most every other penetrant. I spray every nut and bolt before I ever put a wrench on it. Let it sit and watch it get drawn in the threads. I’ve not broken a bolt in years and I work on some really old stuff now. Easy to use, a little bit goes a long way.

Very effective. Gunsmith recommended. Best one yet.

Received Kroil penetration oil can on 4/9/2026 to use on Truck frozen/rusted Air Conditioner bracket Bolt. I Struggled for days trying to losen bolt and did not want to snap bolt. Sprayed this Oil let sit for 20 min. I was able to turn slowly back and forth until off completely. I was amazed how this product works. Very effective and highly recommended. C/ Hillsborough NJ

I’ve been using Kroil for approximately 10 years. It’s helps remove surface rust, loosens fasteners, helps free up stubborn locks, quiet squeaky door hinges and doesn’t smell awful while using it. Great stuff!

This stuf is awesome! Works better than anything else I have tryed. The with or without silicone should be a bit more visible

This is absolutely the best stuff I have ever used. I have purchased this item at least 6 times. However I'm giving it 4 stars because when you have less than a 1/4 fluid remaining, the can doesn't spray anymore. This stuff isn't cheap and there's no reason for this to happen with every can I've purchased.

This is the BEST penetrating oil I have ever used! It gets rusty bolts free faster than any other penetrating oil I've used. They have me as a loyal customer. Especially because I only need to use a little bit unlike others where you have to drowned the bolt so I use less and which makes it less messy and each can lasts longer. Great value! I didn't want to buy it because of the price but now its the only thing I use because of how well it works!

This product has gotten expensive, but it does work well, but because of the price, I think I will have to try to find a replacement product

I'm not a big fan of this cans spraying system... Too much flow under too much pressure but that's a personal thing and i found a way around it... With that being said, the contents inside are fantastic and i won't buy anything else.

I've tried a lot of stuff in the past, but this is the best for extremely rusted nuts and bolts. This is the only stuff I'll buy from now on.

An absolute must buy for freeing up any parts. Used this on a part of printing machine that had seized. Tried many different sprays & oils none worked as good as this. Now have a can on all machines in the factory.

Expensive but works second to none, you definitely get what you pay for.

Très bon,mais un peu chère