DEF in hydraulic fluid

Our company has a CAT 262D skid steer. Thinking that all the D series have DEF fluid tanks, one of our guys topped off what he thought was the DEF tank but was actually the hydraulic fluid tank. The D machines under 75hp do not require DEF.

About a gallon went in the tank and machine did run for awhile afterwards. To be clear, it never stopped performing while in use. Once we saw the milky fluid and realized the error, we drained the tank, changed the filter and installed fresh hydraulic...

DEF in hydraulic fluid

DEF in hydraulic fluid