Quick View
Product Code: 
£
Basket
Skip to main content
Continue Shopping View Basket

MIL-PRF-6085

MIL-PRF-6085 is a military specification for low-volatility aircraft instrument lubricating oil, also known as NATO Code No. O-147. It is used in aircraft instruments and related precision equipment where stable performance, corrosion resistance, and low evaporation matter.

MIL-PRF-6085 at a Glance

MIL-PRF-6085 covers synthetic hydrocarbon-based lubricating oils for aircraft instruments and related precision equipment. It is used where low evaporation, corrosion resistance, and stable performance across a wide range of temperatures are important. MIL-PRF-6085F is the current revision listed on this page.

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-6085 Revision F
Castrol Brayco 885 Aircraft Instrument Oil 1USQ Can *MIL-PRF-6085 Revision F
Silmid P/N: 
BR88500USQ
In Stock - 4 Available
£52.25 excl VAT
£62.70  inc VAT
AeroShell Fluid 12 Synthetic Ester Oil
AeroShell Fluid 12 Synthetic Ester Oil
Silmid P/N: 
VAR0000125
In Stock
From £45.88 excl VAT
View Details
Nycolube 11B
Nycolube 11B
Silmid P/N: 
VAR0000715
In Stock
From £39.66 excl VAT
View Details
Royco 885 Synthetic Lubricating Oil
Royco 885 Synthetic Lubricating Oil
Silmid P/N: 
VAR0001588
No Stock – Lead time 47 business days from date of order confirmation
From £185.76 excl VAT
View Details
Castrol Brayco 885 Aircraft Instrument Oil 55USG Drum *MIL-PRF-6085 Revision F
Castrol Brayco 885 Aircraft Instrument Oil 55USG Drum *MIL-PRF-6085 Revision F
Silmid P/N: 
BR8850055G
No Stock – Lead time 89 business days from date of order confirmation
£8291.22 excl VAT
£9949.46  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 - MIL-PRF-6085F is the current revision shown here, reviewed in Apr 2022. Earlier revisions are listed below for reference when cross-checking legacy callouts.

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.

MIL-PRF-6085 FAQs

How should I choose between MIL-PRF-6085 revisions?

Match the revision called out in the aircraft AMM or OEM documentation before ordering. The revision history on this page is useful for legacy references, but the required callout should always drive the purchase decision. Where possible, Silmid will supply the most recent revision, but previous stock may still need to be exhausted.

Can MIL-PRF-6085 oil be used in electronic equipment and precision actuators?

Yes. MIL-PRF-6085 is used in aircraft instruments and related applications where low volatility and corrosion resistance are important, including electronic equipment and precision actuators where the specification calls for that performance profile.

What should I check before ordering a MIL-PRF-6085 product?

Check the product page and product description for the exact grade, size, and paperwork before purchase. That helps confirm the item supplied matches the MIL-PRF-6085 requirement you need.