Phillips 66 X/C 5606A Aviation Hydaulic Fluid is formulated to provide protection under severe-duty applications. Phillips 66 X/C 5606A Aviation Hydaulic Fluid is red-dyed, mineral-based fluid. Phillips 66 X/C 5606A Aviation Hydaulic Fluid's superior additive technology provides excellent low-temperature fluidity as well as exceptional anti-wear capability, oxidation and corrosion inhibition, and shear stability.