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NO WD-40! WD-40 is actually a solvent and definitely will breakdown factory grease and then dry out causing more friction. Friction is metal to metal and will cause quick failures and costly repairs. Furthermore, it lures in airborne dirt and dust to it. We recommend using a high quality silicon spray. The heavier the silicon spray, the more effective. The heavier spray has a tendency to lubricate for a longer time. If you are using your door a great deal, I would recommend using it every 6 months.