A fluid rated at 250 SSU has a __________ than a fluid rated at 150 SSU.

The reasoning behind selecting a fluid rated at 250 SSU having a higher viscosity than a fluid rated at 150 SSU is based on the definition of viscosity and the significance of the Saybolt Universal Seconds (SSU) measure. SSU is a kinematic viscosity measurement that indicates how resistant a fluid is to flow. A higher SSU rating implies greater resistance to flow, which corresponds to a thicker, more viscous fluid.

In this case, a fluid with a rating of 250 SSU has a greater viscosity compared to a fluid with a rating of 150 SSU. This higher viscosity means the 250 SSU fluid will have a slower flow rate under the same conditions compared to the 150 SSU fluid. This understanding of viscosity is crucial in hydraulic applications, as it affects how fluids behave under different pressures and temperatures, influencing the performance of hydraulic systems.