No, you should never spray standard WD-40 or similar multi-use water-displacing aerosols directly into a ceiling fan motor or bearing housing to stop a squeak. While WD-40 temporarily loosens stuck parts, it is primarily a solvent rather than a true lubricant; it will quickly strip away factory-applied grease, dry out internal components, attract dust and lint into the motor housing, and create a severe fire hazard. You can troubleshoot motor noise safely by shutting off power at the breaker before inspection. You can verify that your corrective action is successful when cleaning away old residue and applying proper non-drip SAE 20 non-detergent electric motor oil drops specifically designed for ceiling fan sleeve bearings eliminates squeaks safely.
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