The Best Treadmill Belt Lubricant and How to Lubricate Your … WebApply about three to five applications of your lubricant on either side of the belt (read the lubricant application instructions). Lower the treadmill belt. Plug your machine back in. Start your treadmill at a slow speed (about 3 mph) for 5 to 6 minutes with no weight on the machine. This should help evenly distribute the lubricant.