BG In-Force Ion-Activated Penetrating Oil 15.7 oz. PN 438

Enforce spray works great

It costs a little bit, but extremely worth it.

This is the best lubricant / penetrating oil I’ve ever found. Nothing compares. I use it for everything that needs lubricating oil. Worth the cost.

This is the best lube I have ever used

Definitely penetrates the rust.

Works great

I found a can of this stuff in a car I bought on marketplace and it was brand new so I decided to start using it and I discovered it is one of my most favorite penetrating oils ever so I decided to go find it and I got on Amazon it is little expensive

20 plus year automotive technician in the rust belt.. "Michigan" I know a thing or two about getting rusted fasteners free. Aside from using a torch or inductive heat regularly to help get fasteners free some times there are just places you cant heat up for your safety, or maybe componant damage reasons. This bg oil is the best on the market. Bg rep forever ago claimed it "climbs up rust"... Lol well it just might, out performs all competetors that I have come across. Used them all too, pb blaster, liquid wrench, wurth, ect. Dont get me wrong sometimes heat is the only option to free, but if theres any oil that could its this. TIP I have had stuff that wouldnt come loose on the spot after spraying, it was end of day so soaked and came back in the morning and it came loose with no effort.