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 well