The WD in WD 40 stands for Water Displacement. : r mildlyinteresting Types, Materials and Components of Lubricating Systems Did you know WD 40 isn't actually a lubricant? It's a water dispersant (hence the name: Water Displacement, 40th formula). For long term lubrication, especially on moving parts like hinges or bearings, always follow Maxima 73920 MPPL Multi Purpose Penetrant Lube 14.5 Oz Aerosol, Rust Protection, Water Displacement, Fogging Oil WD 40 Classic Multi Use Product 01032 Aerosol Multipurpose Water Displacement Lubricant Spray with Big Blast Nozzle, 311g Walmart.ca