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We actively supply a comprehensive line of MIL-SPEC and commercial lubricants.

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Castrol Aero 40Castrol Aero 40 Yellow

Castrol Aero 40 Yellow

Landing Gear Shock Strut Fluid

Castrol Aero 40 Product Description:
Castrol Aero 40 is a special run, stoddard solvent calibrating fluid.  
Castrol Aero 40 is a high quality, MIL-PRF-5606 based, ISO Grade 15 mineral hydraulic fluid which contains a shear stable viscosity index improver, anti-oxidant, anti-wear agents, and an approved EP additive system which reduces martensitic streaking of landing gear outer cylinders and galling of shock strut upper bearings. Castrol Aero 40 is available in two versions: red dyed (Douglas Aircraft) or straw colored (yellow) undyed (Boeing Spec BMS 3- 32, Type II).

Castrol Aero 40 Uses:
Castrol Aero 40 is designed for use in landing gear shock struts. It is compatible with approved MIL-PRF-6083 and MIL-PRF-5606 hydraulic fluids. It is not completely compatible with synthetic gas turbine lubricants or with phosphate-ester hydraulic fluids. It is compatible with other petroleum-based and synthesized hydrocarbon lubricants but contamination should be avoided in order to maintain the unique properties of Castrol® Aero 40. This product is compatible with seals, hoses and paints normally used in shock struts and dispensing equipment connected with this application. While certain grades of the above materials are fully compatible with Castrol® Aero 40, it is advisable to confirm acceptability of use with either the material manufacturer or the appropriate technical support contact.

Castrol Aero 40 Approval Status:
Approval Status Castrol Aero 40 -Red is formulated in accordance with Douglas Aircraft Specification DPS 3.334, and referenced as Douglas stock number DPM 6176. Additionally, Castrol® Aero 40 Yellow 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. These letters 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. Castrol® Aero 40 Yellow is fully approved to Boeing BMS 3-32 (Type II).

Shelf Life:
Castrol Aero 40 has a maximum recommended shelf life of 6 years from date of manufacture. This shelf life assumes that the product is stored in its original unopened packaging in ambient temperature conditions

Health, safety and environmental information are provided for this product in the Materials Safety Data Sheet. This gives details of potential hazards, precautions and First Aid measures, together with environmental effects and disposal of used products. Castrol will not accept liability if the product is used other than in the manner or with the precautions or for the purpose(s) specified. Before using the product other than directed, please contact Castrol for consultation.

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