Best Penetrant to Remove Differential U-Bolts?

Kern Dog said

Screw that.
I reuse them all the time. Stuff over here doesn't rust and break when you work on it.

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There you go. Even though they are supposed to be one time use, I agree with you. As long as they break loose easily, I'll reuse them too. I coat the threads with RTV when I go back. They won't rust up then.