Aeroshell 555 Turbine Engine Oil 1 USQ

U.S. Approved DOD-L-85734
British Approved DEF STAN 91-100 (Note: both UK and US production are manufactured to the same formulation.)
NATO Code O-160
Joint Service Designation OX-26
Pratt & Whitney Approved 521C Type II
General Electric Approved D-50 TF 1
Allison Approved EMS-53


AeroShell Turbine Oil 555 is an advanced 5 mm2/s synthetic hindered ester oil
incorporating a finely balanced blend of additives to improve thermal and oxidation
stability and to increase the load carrying ability of the base oil.
AeroShell Turbine Oil 555 was specifically developed to meet the high temperatures
and load carrying requirements of SST engines and the DEF STAN 91-100 (formerly
DERD 2497) and XAS-2354 specifications. AeroShell Turbine Oil 555 was also
designed to give enhanced performance in current engines.
More recently with the need to transmit more power and higher loads through
helicopter transmission and gearbox systems (many helicopters use a synthetic
turbine engine oil in the transmission/gearbox system) it has become apparent that
the use of a very good load carrying oil, such as AeroShell Turbine Oil 555 is
necessary. This in turn has led to the development of a U.S. Military Specification,
DOD-L-85734 (now DOD-PRF-85734A), which covers a helicopter transmission oil
against which AeroShell Turbine Oil 555 is fully approved.
AeroShell Turbine Oil 555 contains a synthetic ester oil and should not be used in
contact with incompatible seal materials and it also affects some paints and plastics.
Refer to the General Notes at the front of this section for further information.

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