English to Spanish Tech/Engineering Chemistry; Chem Sci/Eng

En unas hojas técnicas de lubricantes:

"...While many of the additives used to formulate a UTTO and a STUO fluid are similar in functionality, they may have a deleterious effect if not incorporated properly. For example, some anti-wear and some extreme pressure additives used in engine oils can be extremely corrosive to the copper components in hydraulic pumps..."

Generally UTTO and STUO fluids **are designed as first intent fluids** to meet specific manufacturer requirements. UTTO fluids generally meet the specification requirements of, and are thus preferred for use in, North America. STUO fluids generally meetthe specification requirements of, and are thus preferred for use in, Europe and other foreign regions. "

UTTO = Universal Tractor Transmission Oils
STUO = Super Tractor Universal Oils

No tengo claro lo que quiere decir la expresión. Muchas gracias por adelantado