X/C® 5606H & 5606A Avia
X/C® 5606H & 5606A Aviation Hydraulic Fluids
Item # PR0027
Phillips 66® X/C 5606H and X/C 5606A Aviation Hydraulic Fluids
are mineral oil-based, high viscosity index, ashless (zinc-free)
antiwear hydraulic fluids designed to meet the severe demands
of aerospace and industrial applications. They have excellent
oxidation resistance and outstanding low-temperature properties
for use over a wide temperature range. They provide excellent
wear protection for hydraulic pumps and motors, protect
hydraulic system components against rust and corrosion, and are
resistant to excessive foam buildup that can cause poor or
sluggish hydraulic system response.
X/C 5606H Aviation Hydraulic Fluid meets the cleanliness
requirements for “super clean” hydraulic fluid for use in modern
aircraft hydraulic systems. X/C 5606A Aviation Hydraulic Fluid is
recommended for use in hydraulic systems that do not require a
“super clean” fluid. Both fluids are dyed red for identification and
leak detection purposes.
X/C Aviation Hydraulic Fluids are recommended for use in
non-pressurized systems operating between -54°C and 90°C
(-65°F to 194°F), and in pressurized systems operating between
-54°C and 135°C (-65°F to 275°F) at pressures up to 3,000 psi.(1)
Typical applications include:
  • Aircraft and missile control systems, autopilots and shock absorbers
  • Auto wreckers, boom trucks and electrical service equipment (cherry pickers) where all-weather performance is required
  • Industrial robotics
  • Hydraulic systems that require a “super clean” fluid for extended service life and reliability (X/C 5606H)
(1)Note: Do not use these fluids in hydraulic systems with natural rubber elastomers.
X/C 5606H Aviation Hydraulic Fluid meets the requirements of:
  •  U.S. Military Specification MIL-PRF-5606H (supercedes
MIL-O-5606, AN-O-336, AN-VV-O-336 and AAF-3580)

X/C 5606A Aviation Hydraulic Fluid meets the requirements of:
  • • U.S. Military Specification MIL-H-5606A (obsolete)

  • Very high viscosity index for use over a wide temperature range
  • Outstanding low-temperature properties
  • Excellent wear protection
  • Resists deposit formation and viscosity increase due to oxidation
  • Protects against rust and corrosion
  • Good foam resistance
  • Does not contain zinc or other heavy metals

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