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Penetrating fluid removes stuck boltsBolts that are heated like in the exhaust manifold/catalytic converter/muffler are easy to break. Spray bolts with penetrating lubricant like PB Blaster, Liquid Wrench, or WD40. Spray and let soak for several times a day for about three days. Really stuck bolts may need to be tapped with a hammer to try to get the penetrating fluid to get into the threads.

WD40 IS A LUBRICANT - it will NOT break up rust.

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Q: How do you to remove old exhaust bolts when they are rusted?
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