Skydrol LD-4

The world’s best-selling Type IV aviation hydraulic fluid, Skydrol LD-4, features low density, valve erosion prevention, and deposit control. Erosion resistance is made possible by a breakthrough anti-erosion additive and acid scavenger found in the formulation. For more than 35 years, there has been no change in the formulation, giving LD-4 the reputation as the premier aviation hydraulic Type IV fluid.