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.

Aerokroil, or Kroil, is 100% the best penetrating oil, there is no comparison! We’ve all used WD, and it has uses, and many of us have used and loved PB, but Kroil is in another class all together! First time I used it was when trading in an old truck and I couldn’t unlock my hitch pin, even with PB (which I swore by at the time), the dealer grabbed his can and gave the locking hitch pin a couple quick shots and then said “give it a minute”. After a brief pause I tried my key again and it instantly turned like new! He gave me the can and related his experience with it and praise for it. Since that day, probably 7yrs ago, I’ve used AeroKroil (aerosol version) and a wide variety of tasks and have seen it seemingly work miracles! One example would be my use of it on dead bearings, I work on conveyors amd so deal with a lot of rollers which eventually freeze up from rust. I’ve had 100% dead rollers, ones that I couldn’t turn even a little with a long pipe wrench, restored to absolutely free spin with application of this penetrating oil. I just spray a bit on the end by the earring and let it soak in for a bit then I give it a turn, there’s usually a millimeter of resistance but I’m able to easily further bearing past that and then I give them a good spin by hand and they are back to functioning perfectly! Just this past week my father called and told me that the can I gave him fixed a neglected yard aerator that he borrowed from a neighbor. He said it had been unused for years and that when he got it the wheels with the tines were all frozen together as one (they are supposed to turn independently) and that the axle itself was hard to turn. He remembered the can I gave him and how good I said it was and decided to try it. Sprayed the wheels and the axle then let it soak for a while and then was easily able to break them loose from their rusted grave and that now this old weathered and unmaintained piece of equipment worked as good as new! He said he was impressed and was happy to not only be able to use it the aerator but also to give it back in vastly better condition than it was in when he borrowed it! Cheaper oils have their place, but when something is absolutely stuck or rusted or even just noisy or not smooth enough what you need is Kroil! They made me a fan and I’ve regularly carry cans of AeroKroil along with some of their other products such SiliKroil and Penephite. FYI SiliKroil is Kroil plus silicone and works great for applications where the oiled parts will be exposed to water such as the carrier slides on the equipment I run. Penephite is Kroil and graphite, it’s great for things where you’d use graphite such as internal metal on metal parts that are not easily accessed and have no built in means of lubrication, it’s extremely useful for oiling locks and I use it on my houses exterior doors as well as automotive door locks. …back to the product at hand, AeroKroil (Kroil), it is simply the finest penetrating oil I know of and if you try it it will become your preferred oil whether it’s for use around the house or on multimillion dollar equipment!

Great stuff at loosening rusty nuts and bolts. I have never seen an aerosol spray leak? It’s an aerosol application is easy by its nature. Speed? It’s still Kroil. It’s an oil! How noisy is a can of aerosol?

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.

Great product..Will buy more..👍👍👍

Très bon,mais un peu chère

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.

I had a particularly difficult union to remove with severe corrosion on it. Tried well known penetrants but they did not work, so cleaned them off with a solvent cleaner and applies AeroKroil. After three days of reapplying it, the union was able to be removed. Brilliant product!