KROIL Kano Sili Penetrating Oil King Size, 16.5 oz aerosol -

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.

Stuff just works LOL, all I can say.

It works. Great.

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.

Works great! Used on rusted screws to loosen. Used on squeaky windmill and sticking wind spinners. I have used on other items as well and reach for this so much that I can't remember everything it has worked on.