Kroil Penetrant with Silicone

I was surprised at how great this product works. It loosened frozen screws and bolts faster than any item I tried before. Don't waste your time or money on any thing else.

Amazing product and works better than any other rust penetrant I have ever used. If you have a rusted on part don’t waste your time with other products. Expensive but worth every penny when when nothing else will work!!

Stuff just works LOL, all I can say.

I had a particular use in mind when I needed to remove a O2 sensor on a 28 year old pickup. Knowing that it was likely rusted and seized into place I wanted to ensure I gave myself the best chance or success without stripping the threads. I've used countless different penetrating oils over the past 50 years and spent a lot of time working on older machinery. I had heard some excellent testimonials for Kroil. I sprayed the sensor multiple times over a couple days to let it soak. When I put a wrench on it, I was amazed. After breaking it loose and turning it about 1/2 turn, I was able to remove it with my fingers the rest of the way. It was like it was installed a month ago. It's a little pricey, but if I continue to see this kind of results it will be my go-to. I've been pleased with how it has worked on other projects, but the O2 sensor was the biggest challenge.

The best penetrating oil you'll get. Money was high, but you pay for excellence.

The best I've every used. The only reason I gave 4 star instead of 5 is the price - very expensive but you get what you pay for. I've been using this product for over ten years around the farm and job and it just cannot be beat for loosening corroded bolts and nuts. It definitely is "the oil that creeps". Follow instructions. It doesn't take a whole lot of it but if you have an un-breakable bolt/ nut just give this stuff time to do its magic and you'll be amazed at its effectiveness.

When I owned a stereo store and had electronic workbenches, my technicians all used this stuff to loosen impossibly 'stuck' things. Additionally, as a car nut, I have used it on car parts from the 30's to daily things around the house that WD_40 and similar cannot touch. It is NOT a water displacement solvent (The 'WD' in WD-40) and the stinkiness is unique, and fairly lasting. SO be careful where you use it. Not so great for regular lubrication of most things in your house, as it will stink the place up. It works SO well in getting me out of nasty situations with impossibly corroded and cranky items, that I almost like the smell. But your spouse probably will not. Store it outside or in the basement, too. My older brother was a 50's hot rodder and mentioned it during a phone call, and that he couldn't easily find it anywhere in Ohio at the stores. I immediately bought two different types of KROIL penetrating oil , spray and liquid, and sent to him as a gift. He is very happy to have it on his shop bench again! Now I need to order some for myself again. It is hard to find any really good 'deals' on this stuff, and for some reason, most hardware and auto parts stores don't seem to stock it , at least in the SF Bay Area (and NE Ohio). If you get together with some friends and bulk order it, it might be worth checking the price directly from Kano.

It works. Great.