It’s important to keep your chain lubricated. Not only will this make your bike’s drivetrain quieter and smoother-running, it’ll also reduce chain and tooth wear, increasing the lifespan of the components, and improve mechanical efficiency, allowing more of the power you put through the pedals to reach the rear wheel.
There are many different types of bike-specific lubes (wet, dry, wax, etc). Each has its own pros and cons, and intended use. Wet lubes, as tested here, are designed for riding in damp or year-round conditions and, as such, generally contain greater quantities of higher-viscosity synthetic oils, along with friction-reducing additives such as PTFE (Teflon) and carrier fluids that evaporate after application.
You get more lubricant per millilitre of fluid with this type of lube, and the increased viscosity means…