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In Sweden, we mainly use 5-56 for "everything", but in the U.S. WD-40 seems to be the thing.

Both seem to penetrate deeply, dissolve rust and do some slight lubrication.

Just curious to the differences, if any any.

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You can add Phosphoric Acid (or Cola) to help the WD-40 along (or to shine your rusty chrome!) –  Spechal May 11 '11 at 4:41

2 Answers 2

up vote 3 down vote accepted

They are competing products that are both advertised to do the same five things (WD-40, CRC 5-56). It's not clear that one is any better than the other.

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How about PB-Blaster? Anybody use it? –  BrianK May 11 '11 at 17:58

PB Blaster is truly a superior penetrant to loosen frozen threaded fasteners.

PB Blaster

No comparison to WD-40 or CRC 5-56

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Could you describe how and why it works better? –  BMitch Jan 21 '13 at 12:52

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