KeyTone Line Guitar Lubricant provides a superior treatment for a guitar’s friction issues. Excellent for Tuning Machines, nut slots and saddles surfaces. A small amount goes a long way, providing a very clean way to accurate conditioning of your instrument. Because KeyTone Line lubricant is pure synthetic, it provides very stable and predictable properties. Petroleum based machine and gear oils are made from refined crude oil and contain impurities. These impurities interfere with film strength and wear protection. They are prone to forming deposits. In addition, many popular natural oils turn rancid over time. KeyTone Line Guitar Lubricant is a superior synthetic that will last indefinitely in storage, due to the pure synthetic nature. It is thinned temporarily with a special solvent car.