Good advice,however as service manager for Wolseley Horse clippers of England, I would advise that whilst using WD40 to protect blades from rust during storage is fine, never ever be tempted to use WD40 to lubricate clipper blades on the machine whilst clipping. Use only an oil recommended by the machine maker, this will save you from overheating and prematurely blunt blades..plus expensive repairs to your machine.
Whilst WD40 is fine to spray on blades when storing them, to prevent corrosion. Never be tempted to use it to lubricate the blades whilst running the machine. Only use proper clipper lube, which is designed for the purpose
This article some may find not as interesting as I do. I am a beginner at clipping my own horses and appreciate all the tips on clipping and clippers that I can find.