From The Yamaha Website:

New Synthetic Formula
Yamaha Superior Valve Oils are based on a newly developed synthetic formula. The Superior Valve Oil synthetic formula is more consistent than mineral based oils and provides superior performance in all playing environments.

The advanced formula is produced using a consistent molecule size. Standard valve oils contain mineral oil which is made up of molecules varying in size. The varied molecule make-up of mineral oil allows the oil to evaporate at an uneven rate, leaving high viscosity particles behind. The even molecules found in the new Yamaha Superior Valve Oil synthetic formula allow the oil to evaporate smoothly, guaranteeing a longer life and extremely responsive action.

Resistance and Evaporation illustration
Enhanced Anti-Corrosive Additive
Yamaha Superior Valve Oils contain a unique anti-corrosive agent which greatly outperforms the competition. The new additive prevents all types of corrosion and will protect valves and valve casings in nearly every playing environment.

Three Viscosities:

Three different viscosities are available for all instrument types:

Superior Valve Oil Light

* Light YAC LVO Designed for instruments with a tight valve clearance
* Provides fast action, yet is long lasting
* Ideal for Xeno trumpets and other professional and intermediate instruments

Superior Valve Oil Regular

* Regular YAC RVO Designed for instruments with a regular valve clearance
* Great for any instrument from student to professional

Superior Valve Oil Vintage

* Vintage YAC VVO Designed for instruments with a large valve clearance
* Provides fast action despite heavy viscosity
* Ideal for vintage and low brass instruments

Child Resistant Container:

To make this a safe product for all, Yamaha Superior Valve Oil features a new child-resistant container which prevents any small children from accidentally ingesting the product.