MIL-PRF-7808

What is MIL-PRF-7808?

MIL-PRF-7808 is a United States military performance specification that details the requirements for synthetic base lubricating oil intended for use in aircraft turbine engines.

This specification (formerly MIL-L-7808) covers high-quality polyol ester base stocks compounded with additives to provide enhanced resistance to oxidation and corrosion, as well as improved anti-wear protection. These qualities are essential for maintaining the longevity and efficiency of critical military and commercial aerospace systems operating under a wide range of conditions, particularly those requiring superior low-temperature fluidity and clean operation.

The lubricating oil meeting MIL-PRF-7808 is used in specific models of:

Aircraft turbine engines
Helicopter transmissions
Accessory and auxiliary power units (APUs)
Other equipment requiring a synthetic base oil with these characteristics.

Variations of MIL-PRF-7808

The MIL-PRF-7808 specification covers two distinct grades of synthetic base lubricating oil, classified based on viscosity and thermal stability requirements:

Grade	Intended Use	Key Characteristics	NATO Code
MIL-PRF-7808 Grade 3	Standard/general-purpose lubricant for most applications.	Excellent low-temperature performance, recommended for APUs and engines subject to "cold soak."	O-148
MIL-PRF-7808 Grade 4	Specified for applications requiring higher viscosity and greater thermal stability.	Designed for more demanding operational environments under elevated temperatures and stresses.	O-163

It's crucial to consult the latest version of the MIL-PRF-7808 specification (currently MIL-PRF-7808M) for the most accurate and up-to-date information.

Equivalent Specifications & Codes

In certain applications, MIL-PRF-7808 (Grade 3 or 4) can be cross-referenced to the following international and industry specifications and codes:

Code Type	Grade 3 Equivalent	Grade 4 Equivalent
NATO Code	0-148	O-163
Joint Service Designation (JSD)	OX-9	N/A

Note: There are no direct, widely cited European Defence or French specifications cross-referenced in the same way for this particular specification.

These products either meet or are approved to the MIL-PRF-7808 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-7808 paperwork.