Valero- : A combining form (also used adjectively) indicating derivation from, or relation to, valerian or some of its products, as valeric acid; as in valerolactone, a colorless oily liquid produced as the anhydride of an hydroxy valeric acid.

Example:
What is the difference between 76 gasoline and valero gasoline? What is better for my 2002 chevy s10?

Taxonomy
Valero, business, marketing, Valero Texas Open, North America, supplying products, excellence in business, energy, jet fuel, world-class excellence, the distillers, gas, independent refiner, marketer, clean-burning, gasoline, asphalt, polymers.

Defination from the web:
Diversified energy company engaged in the production, transportation, and marketing of clean-burning fuels and natural gas.