Yamaha synthetic valve oil is more consistent than traditional oils, giving it better stability in different temperatures. In addition to a smoother feel, you will also be adding to the life of your instrument thanks to a powerful corrosion inhibitor contained in the oil. The vintage viscosity formula is a thicker oil for older instruments with looser valves to give smooth, long-lasting action. It is also ideal for instruments with larger valve pistons such as tubas and euphoniums.