Castrol Aero™ 40 is a high quality, mineral based MIL-H-5606 hydraulic fluid containing a highly shear stable viscosity
index improver, an anti-oxidant, anti-wear agents, and an approved EP additive which reduce martensitic streaking of
landing gear outer cylinders and galling of shock strut upper bearings. Aero 40 is available in either dyed red (Douglas
Aircraft) or undyed, straw colored (Boeing Spec BMS 3-32, Type II).
Specification :
Aero 40 -Red is formulated in accordance with Douglas Aircraft Specification DPS 3.334, referenced as douglas stock
number DPM 6176. Additionally, Aero 40 is formulated as an alternative to Boeing Service Letters 707-SL-12-2; 727-SL-12-
2; 737-SL-12-2; and 757-SL-27-15-B, which instruct the addition of an EP additive to either the standard or corrosion
inhibited mineral based hydraulic fluid for use in their landing gear shock struts.
