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MIL-PRF-6085

MIL-PRF-6085, where "MIL" = Military, "PRF" = Performance specification "6085" = Unique identifying number is a military specification that sets the standards for synthetic hydrocarbon-based lubricating oils used in aircraft instruments. These oils are designed to operate effectively under a wide range of temperatures and environmental conditions, making them suitable for use in military and aerospace applications. This is a low volatility oil, identified by military symbol OAI and NATO Code No. O-147

MIL-PRF-6085 Product List

These products either meet or are approved to the MIL-PRF-6085 specification. Please consult the product page and product description for the specific grade/size you intend to purchase to ensure it will be supplied with MIL-PRF-6085 paperwork.

Castrol Brayco 885 Aircraft Instrument Oil 1USQ Can *MIL-PRF-6085E
Castrol Brayco 885 Aircraft Instrument Oil 1USQ Can *MIL-PRF-6085E
Silmid P/N: 
BR88500USQ
No Stock - Standard lead time 66 business days
£54.32 excl VAT
£65.18  inc VAT
AeroShell Fluid 12 Synthetic Ester Oil
AeroShell Fluid 12 Synthetic Ester Oil
Silmid P/N: 
VAR0000125
In Stock
From £46.67 excl VAT
View Details
Nycolube 11B
Nycolube 11B
Silmid P/N: 
VAR0000715
No Stock - Standard lead time 45 business days
From £34.98 excl VAT
View Details
Royco 885 Synthetic Lubricating Oil
Royco 885 Synthetic Lubricating Oil
Silmid P/N: 
VAR0001588
No Stock - Standard lead time 59 business days
From £181.03 excl VAT
View Details
Castrol Brayco 885 Aircraft Instrument Oil 55USG Drum *MIL-PRF-6085E
Castrol Brayco 885 Aircraft Instrument Oil 55USG Drum *MIL-PRF-6085E
Silmid P/N: 
BR8850055G
No Stock - Standard lead time 87 business days
£8500.19 excl VAT
£10200.23  inc VAT

Advantages & Features

  • Low evaporation: This is crucial for aircraft as they operate in a wide range of temperatures, and oil with high volatility would evaporate quickly at high altitudes.

  • Protection from wear and tear: MIL-PRF-6085 oil helps minimise friction and wear on moving parts in aircraft.

  • Corrosion and oxidation resistance: The oil's properties help prevent corrosion and oxidation of metal components.

  • Appearance: Clear, transparent, and consistent in appearance.

Versions and revisions

MIL-PRF-6085F - Recent amendment to the specification. Reviewed in Apr 2022.

MIL-PRF-6085E - Established in Dec 2011, superseding the previous version that was established in 1998.

MIL-PRF-6085D -Superseds version C, established in Feb 1998.

MIL-L-6085C - Early version of the spec, (Amendment 1) Dec 1994. Where the prefix  "MIL" = Military specification, "L" = Lubricant, "6085" = unique identification number and "C" = version.