Mobil Jet Oil II is formulated to meet the demanding requirements of aircraft-type gas turbines operating over a wide range of severe operating conditions. The product has a high specific heat in order to ensure good heat transfer from oil-cooled engine parts.  In extensive laboratory testing and in-flight performance, Mobil Jet Oil II exhibits excellent bulk oil stability at temperatures up to 204ºC (400 ºF).  The evaporation rate at these temperatures is low enough to prevent excessive loss of volume.  Key features and benefits include:

FeaturesAdvantages and Potential Benefits
Excellent thermal and oxidation stability Reduces the formation of carbon and sludge deposits
Maintains engine efficiency and extends engine life
Excellent wear and corrosion protection Extends gear and bearing life Reduces engine maintenance
Retains viscosity and film strength across wide temperature range Provides effective lubrication at high operating temperatures
Chemically stable Reduces evaporation losses and lowers oil consumption
Low pour point Eases start-up in low ambient temperature conditions


Mobil Jet Oil II is recommended for aircraft gas turbine engines of the turbo-jet, turbo-fan, turbo-prop, and turbo-shaft (helicopter) types in commercial and military service. It is also recommended for aircraft-type gas turbine engines used in industrial or marine applications. Mobil Jet Oil II is approved against the Standard Performance (STD) classification of U.S. Military Specification MIL-PRF-23699. It is also compatible with other synthetic gas turbine lubricants meeting MIL-PRF-23699. However, mixing with other products is not recommended because the blend would result in some loss of the performance characteristics of Mobil Jet Oil II. Mobil Jet Oil II is compatible with all metals used in gas turbine construction, as well as with F Rubber (Viton A), H Rubber (Buna N), and silicone seal materials.


Mobil Jet Oil II has the following builder approvals
-Honeywell/Lycoming-Turbine engines X
-Rolls-Royce/Allison Engine Company X
-CFM International X
-General Electric Company X
-IAE International X
-Pratt and Whitney Group X
-Pratt and Whitney, Canada X
-Rolls-Royce Limited X
-Honeywell/Garrett-Turbine Engine Company X
-Turbomeca X
-Honeywell-Auxiliary power units and air cycle machines X
-Hamilton Standard-Starters X
-Hamilton Sundstrand corp.- APUs, Constant-speed drives and integrated-drive generators X
Mobil JetOil II
Approved against Mil-PRF-23699F-STD X

Typical Properties

cSt @ 40ºC (102ºF) 27.6
cSt @ 100ºC (212ºF) 5.1
cSt @ -40ºC (-40ºF) 11,000
% change @ -40ºC after 72 hours 0.15
Pour Point, ºC (ºF), ASTM D 97 -59 (-74)
Flash Point, ºC (ºF), ASTM D 92 270 (518)
Fire Point, ºC (ºF) 285 (545)
Autogenous Ignition Temp, ºC (ºF) 404 (760)
TAN (mg KOH/g sample) 0.03
Density @15 ºC, kg/l, ASMT D 4052 1.0035
Evaporation Loss, %  
6.5 hr @ 204ºC, 29.5" Hg 3.0
6.5 hr @ 232ºC, 29.5" Hg 10.9
6.5 hr @ 232ºC, 5.5" Hg 33.7
(Equals pressure @ 40,000 Ft. altitude)  
Foam, ml  
Sequence I, 24ºC 8
Sequence II, 93.5ºC 10
Sequence III, 75ºC (after 200 F test) 8
Foam Stability, after 1 min settling, ml 0
Rubber Swell  
F Rubber, 72 hr @ 204º C, % 15.6
H Rubber, 72 hr @ 70ºC, % 16.4
Sonic Shear Stability, KV @ 40ºC, change, % 0.9
Ryder Gear, Ave. lb/in % Hercolube A 2750 ,115


There are no reviews for this item. Write Review


Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 1 question Browse 1 question and 1 answer
what is colour number and colour of oil?
ashokbhai h on Mar 5, 2018
BEST ANSWER: The color of this is amber.