For every 10 degrees C above 60 degrees C, the oxidation rate of hydraulic fluid?

The correct answer points to a known principle in thermodynamics and chemical reaction rates, specifically the behavior of hydraulic fluid as the temperature increases. As the temperature of hydraulic fluid rises above a certain threshold, such as 60 degrees Celsius, the oxidation rate typically accelerates.

In the specific context of this question, for every increase of 10 degrees Celsius in temperature above 60 degrees Celsius, the rate at which the hydraulic fluid oxidizes is known to roughly double, which aligns with established empirical data concerning oxidation reactions. This doubling is indicative of how chemical reaction rates often increase with temperature in a non-linear manner, resembling the Arrhenius equation, but for this case, the established rule of thumb indicates a doubling effect for each 10-degree rise in temperature.

This information highlights the significance of maintaining proper temperature control for hydraulic fluids to ensure longevity and performance, as higher oxidation rates can lead to degradation of the fluid and potentially harmful effects on the hydraulic system.