WD-40 is good for starting a diesel but for lubrication it is poor as it absorbs water. Inox does the same job and repels water.

To loosen up rusted in place things PB Blaster is far superior.

Here is a quote from their website.

Fair Winds

Eric

Kimberlite Amel Super Maramu #376

 Blaster PB Penetrating Catalyst, which quickly breaks loose the surface tension of frozen parts and protects against further rust and corrosion