Non-silicone lubricants such as WD40 contain additives that could potentially damage the belt. Fasulo advises getting a bottle with an extendable nozzle, such as ProuNol Treadmill Oil or Godora ...

Then there is the silicone itself, which serves as a heat-resistant lubricant for machine parts ... The belt roller on a treadmill, for instance, is a rapidly moving part that might build a ...