An air compressor is a lot like the human body. It requires routine upkeep and regular checkups to make sure it’s functioning as it’s supposed to.  For instance, while a heart pumps blood to keep the body functioning, an air compressor circulates lubricants to keep the machine operating. Without proper lubrication, the air end — the air compressor’s heart — is threatened with high heat, higher energy costs, and lower efficiency. The coolers, plugs and separators become restricted, which could lead to an air compressor “heart attack.”