WD-40 is a Water Displacement compind that has some lubricating properties. It has drawbacks, like the gummy residue and it's ability to remove chrome on sliding parts (like fooseball shafts). I keep a can for drying ignition parts, works great. Haven't bought any for any other reason since I found Kroil.Haven't bought any Kroil since I found PB Blaster. It seems to creep better and not have the silicones (bad for paint jobs...). Kroil seems to be a better solvent, so if the stuck part is gunked, it beats PB. My buddy used it and some hot/cold cycles to remove a breech plug from his 1780's rifle after all othe rtechniques had failed. Took about a month but it cut thru the powder and rust to get it done. I keep some Kroil on had for such things, but day to day I use PB, easier to get and pretty cheap on sale at Murray's. The key to all is to use time, taps, and thermal cycles. Get it warm, hit it with PB, then tap lighlty a few times. let it cool, hit it again and some more taps, then go have a cold one. Repeat for a few days. ANd remember, sometimes it breaks off anyways.
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