Kroil Original Penetrant - Rust Penetrating Lubricant - Corrosion Inhibitor Oil for Chains, Hinges & Stuck Metal Parts - Home & Industrial Use - Drip Can - 8 oz - 4 Pack (AZKL081C4)

Yes, it is crazy expensive. 3-5x the price of the competition. NOT well known. No advertising. Limited availability. But wow. This stuff really works. The hype is real. The drip cap is quirky; don't break it. Used just a few drops on some very heavily rusted parts that had been sitting for 20 years. A few minutes later, they came apart easily. Count me impressed. This 8-ounce can is probably a lifetime supply for most homeowners. Cannot believe this has been around for 80+ years. If you need something that may or may not work and have a thin wallet, buy one of the many choices at the big box store. If you have expensive parts that absolutely need to come apart, pay the price. You will not be disappointed

I’ve been using Kroil Original Penetrating Oil for a while now, and I can honestly say it’s one of the best penetrating oils I’ve ever used! Whether I’m working on rusted bolts, stuck machinery parts, or even old tools that have been sitting unused for years, this product gets the job done quickly and efficiently. The penetration power of Kroil is unmatched. It seeps into the tiniest cracks and breaks down even the toughest rust and corrosion. In many cases, I’ve been able to loosen parts that I thought were impossible to get unstuck, saving me time and frustration. It works fast, and you don’t have to wait long before you see results. The application is easy, and the spray nozzle gives a controlled, fine mist that ensures the oil gets into the tightest spots without waste. I appreciate how it doesn’t leave a greasy residue after use, making cleanup a breeze.

I wanted to give 4 stars, because this stuff is expensive. This seller is half the price of hardware store tho. This really works on penetrating rust & freeing up stuck parts. I would recommend this seller.

I bought this primarily to free-up my adjustable gas block from carbon lock. No one near me carried anything but the spray, Amazon had the liquid. Great product!

This product worked very well on really tight bolts etc.

Kroil is one of the best if not the best penetration oil out there. This is by far the best cost effective way to buy it, the hard part is both: A- finding a container to dispense it that doesn't leak, break down, or break in general. B- need a good funnel or spout because it pours out everywhere. ( This is the only reason for 4 stars)

A great penetrant and rust penetrating out and so far Amazon is the only place I have found to purchase it, I’ve been using it for years

This stuff reeks, absolutely a "windows open" kind of oil, but I'll be damned if it doesn't work extremely well. I had stuck bolts that wouldn't be set free even with brake cleaner or WD-40, and this stuff was able to penetrate deep into the threads and knock the offending gunk loose, making my life a breeze. It's a bit pricy for sure, but it beats acetylene in terms of leaving parts intact.

This stuff is a life saver when trying to in-stick rusted screws and other metal parts. Used this on several old firearms and haven't messed up a single screw since I've had this. A couple drops and wait a few minutes and you are probably good. Creeps into tight crevices and through rust. This can be expensive to get in Canada but if you have a stuck screw that seems impossible, stop and give this stuff a try. It will save you from having to order new screws more than likely. Smells interesting like cherries and gasoline but now I actually kind of like the smell.

Price is little high comparing with same in market , Smell is very strong

This is simply the best penetrating oil I have come across. Simply magic stuff

Works really well. Helped to liberate a frozen serger, not used since 2007.

Best stuff , expensive