No, applying standard WD-40 to a ceiling fan is strongly discouraged because it acts primarily as a solvent and degreaser rather than a long-term lubricant. While it might temporarily quiet a squeak, it dissolves remaining factory grease, leaves a sticky residue that attracts thick dust and lint into the motor housing, and can eventually cause premature bearing failure or smoke hazards. You can troubleshoot bearing noise safely by turning off power at the circuit breaker before inspection. You can verify that your corrective action is successful when cleaning away old residue and applying a few drops of genuine SAE 20 non-detergent electric motor oil (if your specific fan model features an oil port) resolves the squeaking safely and correctly.
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