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Castrol Aero 40 is a high quality, mineral based MIL-H-5606 hydraulic fluid. This product is supplied in a 55usg drum.

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Castrol Aero 40 Red Hydraulic Fluid 55USG Drum

Silmid P/N: 27069-AWDR
No Stock - Standard lead time 87 business days

Castrol Aero 40 is a high quality, mineral based MIL-H-5606 hydraulic fluid. This product is supplied in a 55usg drum.

Technical Information

  • Commodity Code 27101981
  • Country of Origin United States
EXPORT CONTROL: This product is affected by export control regulations, and as such delivery will be limited to United Kingdom customers only. For more information, please contact your Account Manager, email info@silmid.com or call the office on +44 (0)1675 432 850.

Data Sheets

Download the Castrol Aero 40 technical data sheet (TDS) and the Castrol Aero 40 safety data sheet (SDS) from Silmid today. Once you have logged in or signed up, the datasheet will be visible for download if one is available.

Product Properties

Pack Size
55USG Drum
Product Colour
Castrol Aero
Manufacturer Name
Manufacturer Part Number

Product Information

Castrol Aero 40 is designed for use in landing gear shock struts. Castrol Aero 40 is compatible with approved MIL-PRF-6083 and other MIL-PRF-5606 qualified hydraulic fluids. It is not completely compatible with synthetic gas turbine lubricants nor with phosphate-ester hydraulic fluids. It is compatible with other petroleum-based and synthesised hydrocarbon lubricants but contamination should be avoided in order to maintain the unique properties of Castrol Aero 40.

It 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 Castrol.


  • Approved EP additive
  • Reduces martensitic streaking of landing gear outer cylinders and galling of shock strut upper bearings.

Shipping information

Orders over £100 placed online will now qualify for FREE UK Mainland delivery*

**orders placed through the office will incur additional charges.** 

International delivery (door to door delivery) is available for selected countries worldwide. Shipping will be automatically calculated based on the weight, location and hazardous nature of the goods. Customers can also choose ex works to arrange their own collection.

Please refer to our delivery page for more information.