Why not use WD-40 on garage door?

You should never use standard WD-40 to lubricate your garage door components because it is primarily a solvent and rust dissolver, not a true long-term lubricant. WD-40 stands for "Water Displacement, 40th formula." While it might temporarily stop a squeak by breaking up existing dirt and rust, it essentially strips away any existing grease and leaves the metal parts completely dry shortly after application. Worse, the light residue it leaves behind is highly attractive to dust, dirt, and grime. Over time, this accumulated debris forms a sticky, abrasive paste that creates massive friction within the rollers, hinges, and tracks, ultimately accelerating wear and tear and leading to premature part failure. Instead of standard WD-40, you should always use a high-quality, specialized lithium grease or a silicone-based garage door spray. These dedicated products are specifically formulated to coat the moving metal parts, withstand extreme temperature fluctuations, and repel dust, ensuring smooth and quiet operation for months without causing damage.